Cooking Without Onion and Garlic: A Guide to Allium Intolerance, IBS and the Low FODMAP Diet

For many people, onion and garlic are the starting point of almost every savoury meal. Whether you're preparing a pasta sauce, curry, soup or stir-fry – they're often considered essential for building flavour.

But if you've ever experienced bloating, abdominal pain or digestive discomfort after eating foods containing onion or garlic, you're certainly not alone.

These vegetables are among the most common dietary triggers for people living with Irritable Bowel Syndrome (IBS) and for those who are sensitive to the allium family of vegetables. Fortunately, avoiding onion and garlic doesn't mean giving up delicious, flavourful meals. With the right ingredients and a few simple cooking techniques, it's possible to create dishes that are every bit as satisfying.

In this guide, we'll explain why onion and garlic can be difficult to digest, how this relates to the low FODMAP diet, what allium intolerance is, and how to cook confidently without these common ingredients.

Why do onion and garlic cause digestive symptoms?

Onions, garlic, shallots, leeks and spring onions all belong to the allium family of vegetables. Although they're packed with flavour and nutrients, they also contain high amounts of fructans.

Fructans are a type of carbohydrate that belongs to the FODMAP group. FODMAPs can be poorly absorbed in the small intestine and may cause digestive symptoms in people with sensitive digestive systems.

Unlike many other carbohydrates, humans don't produce the enzymes needed to break down fructans. This fermentation is completely normal, but for people with Irritable Bowel Syndrome (IBS) it can contribute to symptoms such as bloating, abdominal discomfort, excess gas and changes in bowel habits.

If you are new to FODMAPs or would like to understand how diet can influence IBS symptoms, our guide to IBS and the low FODMAP diet provides a detailed overview of how the approach works, including the elimination and reintroduction phases.

 

What is allium intolerance?

You may have come across the term allium intolerance while searching for the cause of your digestive symptoms. Although it isn't an officially recognised medical diagnosis in the same way as lactose intolerance or coeliac disease, it's a term many people use to describe digestive symptoms triggered specifically by vegetables from the allium family.

These include:

• onions
• garlic
• shallots
• leeks
• spring onions
• chives
• garlic scapes
• wild garlic.

For many people, even small amounts of onion or garlic can cause symptoms such as bloating, cramping or discomfort, while other foods are tolerated without any problems.

In many cases, the symptoms are not caused by the allium vegetables themselves but by their high fructan content. This is why onion and garlic are among the first foods removed during the elimination phase of a low FODMAP diet.

If you suspect an intolerance, it's always worth discussing your symptoms with a healthcare professional or registered dietitian. Many digestive conditions can cause similar symptoms, and it's important to rule out other possible causes before making significant dietary changes.

Allium intolerance, IBS and fructan sensitivity: what's the difference?

These terms are often used interchangeably, but they don't all mean the same thing.

Irritable Bowel Syndrome (IBS)

IBS is a functional gastrointestinal disorder characterised by recurrent abdominal pain associated with changes in bowel habits. Symptoms vary from person to person and can be triggered by stress, hormones, certain foods or a combination of factors.

Many – but not all – people with IBS find that reducing foods high in FODMAPs helps improve their symptoms.

Fructan sensitivity

Fructans are one type of FODMAP found in foods such as onion, garlic, wheat, rye, artichokes and asparagus.

Some people appear to react particularly strongly to fructans, regardless of whether they meet the criteria for IBS. Because onion and garlic are among the richest dietary sources of fructans, they are common triggers.

Allium intolerance

The term allium intolerance generally refers to people who notice symptoms specifically after eating vegetables from the allium family.

For some, this sensitivity is linked to IBS and fructans. Others may tolerate small amounts or react differently to cooked and raw forms. Everyone's tolerance is unique, which is why identifying your own triggers is so important.

What is the low FODMAP diet?

The low FODMAP diet is one of the most well-researched dietary approaches for managing IBS symptoms.

Rather than eliminating foods permanently, it is designed as a structured process consisting of three phases:

1. Elimination

High-FODMAP foods are temporarily removed for a short period, usually between two and six weeks.

2. Reintroduction

Foods are gradually reintroduced, one FODMAP group at a time, to identify which carbohydrates trigger symptoms and in what quantities.

3. Personalisation

The long-term goal is to eat the most varied diet possible, avoiding only those foods that consistently trigger symptoms.

This personalised approach helps minimise unnecessary dietary restrictions while supporting good nutrition and a diverse gut microbiome.

Because the diet is quite restrictive, it is generally recommended that it be followed with guidance from a healthcare professional or dietitian trained in the low FODMAP approach.

Is a low fructose diet the same as a low FODMAP diet?

Not quite.

Although the two diets overlap, they are designed for different reasons.

A low fructose diet is intended for people with fructose malabsorption, a condition in which the small intestine has difficulty absorbing excess fructose. Symptoms can include bloating, abdominal discomfort and diarrhoea after eating foods high in free fructose.

The low FODMAP diet, on the other hand, addresses several different groups of fermentable carbohydrates, including:

• fructans
• galacto-oligosaccharides (GOS)
• lactose
• excess fructose
• polyols.

This means that someone following a low FODMAP diet may temporarily reduce foods high in fructose, but they will also be limiting several other carbohydrate groups during the elimination phase.

Some people discover that fructose is one of their personal triggers, while others tolerate fructose well but react strongly to fructans found in onion and garlic.

Can you still enjoy flavour without onion and garlic?

Absolutely.

Although onion and garlic provide a distinctive savoury depth, they're far from the only way to create flavour.

Professional chefs often think in terms of layers of flavour rather than relying on one or two ingredients. Combining aromatic spices, fresh herbs, acidity, umami-rich ingredients and careful cooking techniques can produce meals that are every bit as satisfying.

In fact, many cuisines around the world naturally include dishes that rely more heavily on spices, herbs and aromatics than on onions and garlic.

Whether you're following a low FODMAP diet, avoiding alliums due to digestive sensitivity or simply looking for new ways to cook, learning how to build flavour without onion and garlic can open up an exciting new range of recipes.

In the next section, we'll explore the best onion and garlic substitutes, including asafoetida, ginger, kala namak and cumin, along with practical tips for getting the most flavour from each of them. We'll also share additional herbs, spices and cooking techniques that make gut-friendly meals anything but bland.

The Best Onion and Garlic Substitutes for Flavourful Low FODMAP Cooking

Removing onion and garlic from your cooking can initially feel like a major challenge. They are used in so many cuisines around the world and often form the foundation of savoury dishes.

However, flavour does not come from just two ingredients. Many traditional cuisines rely on a combination of spices, herbs, aromatics and cooking techniques to create depth and complexity.

When cooking without onion and garlic, the key is to replace the flavour function they provide:

• Garlic adds warmth, savouriness and a slightly spicy depth
• Onion adds sweetness, body and a rich background flavour
• Both contribute umami and complexity

By combining different flavour elements, you can create satisfying meals that are suitable for people avoiding alliums, following a low FODMAP diet, or simply looking for new ways to cook.

Here are some of the most useful onion and garlic alternatives to keep in your kitchen.

 

Asafoetida: A Powerful Garlic and Onion Alternative

If there is one spice that is particularly useful when cooking without onion and garlic, it is asafoetida. Also known as hing or asafetida, this spice is widely used in Indian cuisine and parts of the Middle East.

In its raw form, asafoetida has a very strong sulphur-like aroma, which is why it is sometimes described as smelling similar to garlic or onions. However, when heated in oil, its flavour transforms into a much milder, savoury and slightly onion-like taste.

Because asafoetida is extremely concentrated, a little goes a long way. Start with just a small pinch – around one or two pinches added to warm oil – before adding your other ingredients.

A useful cooking technique is to gently fry asafoetida in oil for a few seconds before adding vegetables, spices or sauces. This allows the flavour to develop and creates a more rounded base for your dish.

Cooking tip: If you are new to asafoetida, begin with less than you think you need. Its raw aroma can be surprisingly strong, but the flavour becomes much more subtle once cooked.

Asafoetida works particularly well in:

• Indian curries
• lentil dishes
• vegetable stews
• tomato-based sauces
• soups

For an Italian-inspired sauce without onion and garlic, try combining asafoetida with:

• smoked or sweet paprika
• freshly ground black pepper
• oregano
• basil
• thyme

This creates a surprisingly rich base for pasta sauces, vegetable dishes and Mediterranean-style recipes.

Note for people following a low FODMAP diet: Some asafoetida products contain wheat flour or other ingredients, so it is important to check the label and choose a suitable product if you need to avoid gluten or specific FODMAP ingredients.

 

Fresh Ginger: A Warming Alternative to Onion and Garlic

Fresh ginger is another excellent ingredient for adding depth and complexity when cooking without alliums. Unlike onion and garlic, ginger has a fresh, warming flavour with a gentle spiciness. It works especially well in Asian-inspired dishes, curries, soups and stir-fries.

Fresh ginger is generally much more aromatic than dried, ground ginger. For the best flavour, use fresh ginger root and grate it finely using a small grater.

This helps the flavour distribute evenly throughout the dish and avoids large pieces of ginger that can overpower individual bites.

For most recipes, a piece of ginger approximately half the length of your thumb is enough to create noticeable flavour without dominating the dish.

Ginger pairs particularly well with:

• cumin
• coriander
• turmeric
• asafoetida
• chilli
• lime
• sesame

For an aromatic curry base, gently fry grated ginger with cumin and asafoetida in oil before adding vegetables, spices and liquids. This creates a rich foundation without needing onion or garlic.

Kala Namak: Adding Savoury, Umami Flavour

Kala namak, also known as black salt, is a traditional ingredient used in Indian cooking and across South Asia. Despite its name, kala namak is not actually black. Because of naturally occurring minerals, it usually has a pinkish-grey or purple colour.

What makes kala namak unique is its distinctive sulphurous aroma, which is often compared to cooked eggs. This flavour comes from sulphur compounds naturally present in the salt.

While it is primarily made up of sodium chloride (like regular table salt), the additional sulphur compounds give it a completely different flavour profile.

Kala namak is traditionally used in:

• chaat masala spice blends
• chutneys
• raitas
• savoury snacks

It is also popular in plant-based cooking because its egg-like flavour can add depth to dishes such as tofu scrambles.

When cooking without onion and garlic, kala namak can be useful when you want to add a more savoury, umami-rich note. It works particularly well when combined with:

• cumin
• coriander
• smoked paprika
• turmeric

Because the flavour is quite distinctive, it is best used sparingly. A small pinch can make a noticeable difference.

Cumin: Building a Rich, Aromatic Foundation

Cumin is one of the most valuable spices for creating depth when cooking without onion and garlic.

 

Both whole cumin seeds and ground cumin can be used, but whole seeds develop a particularly rich flavour when toasted.

A simple technique used in many Indian dishes is tempering spices in oil:

1. Heat oil in a pan.
2. Add whole cumin seeds.
3. Allow them to gently toast until fragrant.
4. Add your remaining spices and ingredients.

This releases the natural oils in the spices and creates a much deeper flavour than simply adding spices at the end of cooking.

A simple low FODMAP curry base could include:

• Garlic-Infused Oil: Getting Garlic Flavour Without the FODMAPs
• cumin seeds
• asafoetida
• black pepper
• turmeric
• fresh ginger
• coriander

This combination creates a warm, aromatic foundation for vegetable curries, soups and rice dishes.

Garlic-Infused Oil: Getting Garlic Flavour Without the FODMAPs

For many people following a low FODMAP diet, garlic is one of the hardest ingredients to replace because of its distinctive flavour. One useful alternative is garlic-infused oil.

The reason this works is that fructans—the FODMAP carbohydrates found in garlic—are not soluble in oil. The garlic flavour compounds transfer into the oil, but the fructans remain in the garlic itself.

This means garlic-infused oil can often provide garlic flavour while remaining suitable for a low FODMAP diet.

It can be used for:

• roasting vegetables
• salad dressings
• pasta dishes
• soups
• marinades

Always check the label when buying prepared products, as some garlic oils may contain additional ingredients.

Fresh Herbs and Spices for More Flavour Without Alliums

When onion and garlic are removed from cooking, herbs and spices become essential flavour-building tools. They add aroma, freshness, and complexity, helping dishes feel vibrant and satisfying rather than like something is missing.

Fresh herbs can provide contrast and brightness, while dried herbs and spices can create warmth and depth. Many herbs are naturally low in FODMAPs and can be used to add variety to allium-free cooking.

Great options include:

Basil

Basil is a classic herb for Mediterranean-inspired cooking and pairs especially well with tomatoes, olive oil, and vegetables. Its sweet, slightly peppery flavour makes it ideal for pasta sauces, salads, roasted vegetables, and pesto-style recipes without garlic.

Adding fresh basil towards the end of cooking helps preserve its delicate aroma. Combined with other flavour enhancers such as lemon, black pepper, or umami-rich ingredients, basil can create a fresh and balanced flavour profile.

Parsley

Parsley adds a fresh, slightly peppery flavour that can brighten savoury dishes and balance richer ingredients. While it does not replace the depth of flavour traditionally provided by onion and garlic, it is a valuable herb in allium-free cooking.

Flat-leaf parsley works particularly well in soups, salads, vegetable dishes, marinades, and herb sauces, especially when combined with ingredients such as lemon, olive oil, or umami-rich flavours.

Coriander

Coriander (cilantro) is widely used in Indian, Thai, Mexican, and Middle Eastern cuisines. Its distinctive citrusy flavour makes it a valuable ingredient in recipes where onion and garlic are traditionally used as a flavour base.

Fresh coriander works well in curries, chutneys, salsas, noodle dishes, and rice-based meals. Coriander seeds can also be used as a spice, adding a warm, aromatic flavour to spice blends and slow-cooked dishes.

Chives

Chives provide a mild onion-like flavour and can be a useful option for some people reducing their allium intake. For those following a low FODMAP diet, the green tops of spring onions and chives are often better tolerated than the bulb portions because they contain fewer fructans. However, individual tolerance and portion size are important.

Fresh chives are ideal for adding a gentle savoury note to salads, soups, potatoes, dips, and sauces. They are best added after cooking to preserve their delicate flavour.

Thyme and rosemary

Thyme and rosemary are excellent choices for adding warmth and depth to hearty dishes. Their robust flavours work particularly well in roasted vegetables, soups, stews, slow-cooked meals, and Mediterranean-inspired recipes.

Rosemary has a strong, aromatic character that pairs well with potatoes, root vegetables, and roasted dishes, while thyme offers a softer herbal flavour that complements broths and vegetable-based meals. Using these herbs alongside umami-rich ingredients can help create satisfying allium-free dishes with plenty of complexity.

Tips for Building Flavour Without Onion and Garlic

Cooking without alliums often requires changing your approach slightly. Instead of relying on onion and garlic as a starting point, focus on building layers of flavour.

Toast Your Spices

Heating spices briefly in oil helps release their aromatic compounds and creates a deeper flavour.

Add Umami-Rich Ingredients

Umami creates the savoury, deeply satisfying quality often associated with onion and garlic. It is known as the fifth basic taste, alongside sweet, sour, salty, and bitter, and comes from naturally occurring compounds such as glutamate that stimulate our taste receptors. Umami adds richness, balance, and complexity to a dish, making flavours feel more complete and rounded. The taste was first identified in 1908 by Japanese chemist Kikunae Ikeda, who discovered that the distinctive savoury flavour of kombu broth came from glutamic acid.

For people avoiding alliums or following a low-FODMAP diet, umami-rich ingredients can help replace some of the flavour complexity that is often lost when onions and garlic are removed.

Some naturally umami-rich ingredients that can add depth to allium-free cooking include:

• Fermented ingredients – such as miso, tamari or soy sauce
• Mushrooms where tolerated – especially dried shiitake, which have a concentrated savoury flavour
• Tomatoes and tomato paste – naturally rich in glutamates, especially when cooked down
• Nutritional yeast – adds a savoury, cheese-like note
• Seaweed – such as kombu, traditionally used to create flavourful broths

Combining several umami sources with herbs, spices, and flavour-infused oils can help create satisfying meals without relying on garlic and onions.

Use Acidity to Balance Flavours

A splash of acidity can bring a dish to life. Try:

• lemon juice
• lime juice
• vinegar
• tamarind

Acidity helps brighten flavours and prevents dishes from tasting flat.

Allow Time for Flavours to Develop

Many flavourful dishes benefit from slow cooking and allowing ingredients to combine. Soups, stews and sauces often taste even better the next day as flavours continue to develop.

Explore More Gut-Friendly Recipes

Cooking without onion and garlic may require some adjustment at first, but it can also inspire a more creative approach to flavour.

By using aromatic spices, fresh herbs and thoughtful cooking techniques, it is possible to prepare meals that are both enjoyable and suitable for people with sensitive digestion.

For more inspiration, explore our collection of gut-friendly recipes, created with carefully selected ingredients and designed for delicious, nourishing meals.

Frequently Asked Questions About Cooking Without Onion and Garlic

What can I use instead of garlic on a low FODMAP diet?

Popular alternatives include garlic-infused oil, asafoetida, fresh ginger, herbs and savoury spices such as cumin and smoked paprika.

What can I use instead of onion in cooking?

Good onion substitutes include asafoetida, spring onion green tops (if tolerated), chives, herbs, spices and slow-cooked vegetables that add natural sweetness.

Is garlic-infused oil low FODMAP?

Yes, pure garlic-infused oil is generally considered low FODMAP because fructans are not soluble in oil. Always check ingredients on commercial products.

Can people with IBS eat onions?

Some people with IBS find onions trigger symptoms because they are high in fructans. However, tolerance varies, and some people may tolerate small portions or certain preparations.

Is allium intolerance permanent?

Not necessarily. Some people find their tolerance changes over time, especially after identifying personal triggers through structured dietary approaches such as FODMAP reintroduction.