Thai Aromatics Explained: Lemongrass, Galangal and Makrut Lime Leaves

Thai cooking is famous for balancing salty, sour, sweet and spicy flavours, but flavour is only part of the story. Aroma matters just as much. Open a pot of Tom Yum or Tom Kha and the first thing you notice is often the fragrance of lemongrass, galangal and makrut lime leaves.

These three fresh Thai aromatics are often used together, but they do different jobs. Lemongrass brings a clean citrus fragrance. Galangal adds peppery, resinous depth. Makrut lime leaves provide an intense floral citrus aroma. Once you understand those differences, it becomes much easier to season a soup, brighten a curry or build a curry paste with confidence.

Here is how to recognise, prepare and use each ingredient — including which pieces are meant to be eaten and which are simply there to perfume the dish.

The three aromatics at a glance

Ingredient	Thai name	What it contributes	Best preparation	Common uses
Lemongrass	Takrai (ตะไคร้)	Clean, fresh citrus fragrance	Bruise for infusing; finely slice or pound for eating	Tom Yum, curries, broths, marinades and salads
Galangal	Kha (ข่า)	Peppery, citrusy and resinous depth	Slice into thin coins or pound into a paste	Tom Kha, Tom Yum, curry pastes and broths
Makrut lime leaves	Bai makrut (ใบมะกรูด)	Intense floral citrus aroma	Tear to infuse; remove the rib and finely shred for eating	Curries, soups, stir-fries and garnishes

The leaves are also commonly sold in the UK as “kaffir lime leaves”, including in some product names. We use the name makrut lime leaves in this guide.

Lemongrass: clean citrus fragrance

Fresh lemongrass, or takrai, has a bright, lemony fragrance without the sharp acidity of lemon juice. The pale lower part of the stalk holds the most flavour; the green upper section is tougher and milder.

How to prepare lemongrass

Start by trimming away the root end and dry upper leaves. Peel off any tough or damaged outer layers, then choose the preparation method to suit the dish:

• For soups and broths: cut the lower stalk into short lengths and lightly bruise each piece with the side of a knife or a pestle. This breaks the fibres and helps the fragrance infuse into the liquid.
• For curry pastes and marinades: slice the tender inner stalk very finely across the grain before pounding or blending it with the other ingredients.
• For salads and edible garnishes: use only the tender inner core and slice it into extremely fine rounds. If the slices feel fibrous, they are too thick or from too tough a section.

Large bruised pieces are generally used for infusion rather than eating. Treat them much as you would a bay leaf: leave them in the pot while it cooks, then move them aside in the bowl or remove them before serving.

Where to use lemongrass

Lemongrass is essential in many Thai soups, but it is equally useful in coconut curries, grilled meat marinades, seafood dishes and fragrant stock. Its clean aroma lifts rich coconut milk and helps a spicy dish feel fresh rather than heavy.

Galangal: peppery, resinous depth

Fresh galangal, or kha, may look a little like ginger, but its flavour is distinctly different. It has a firmer texture and a more peppery, citrusy, almost pine-like aroma. That unmistakable character is central to dishes such as Tom Kha Gai — its name literally points to galangal.

Is galangal the same as ginger?

No. Galangal and ginger are related, but they are not interchangeable. Ginger is warmer and sweeter, while galangal is sharper, more aromatic and resinous. If a Thai recipe specifically calls for galangal, ginger will change the identity of the finished dish rather than reproduce it.

How to prepare galangal

Galangal is dense, so use a sharp, sturdy knife and cut carefully:

• For soups: slice it thinly into coins. Thin slices expose more surface area and release more aroma into the broth.
• For curry pastes: cut it into small pieces across the fibres before pounding or blending. Starting small makes it easier to create a smooth paste.
• For younger, tender galangal: very fine slices can sometimes be eaten, depending on the dish. Larger or older pieces remain fibrous and are normally left in the bowl after their flavour has infused.

Peeling is not always necessary when the skin is clean and tender, although any dry, damaged or particularly tough areas can be trimmed away.

Where to use galangal

Galangal gives Tom Yum and Tom Kha their deeper aromatic backbone. It also appears in curry pastes and dipping sauces, where its peppery fragrance sits underneath brighter herbs, chillies and lime.

Makrut lime leaves: an intense floral citrus aroma

Makrut lime leaves, or bai makrut, are glossy leaves with a powerful perfume. Their aroma is more floral and concentrated than lemongrass, so even a small amount can transform a curry or soup.

It helps to remember one simple distinction: use makrut lime leaf for aroma and lime juice for sourness. The leaf smells vividly citrusy, but it does not provide the fresh acidity that balances a finished Tom Yum or dipping sauce.

How to prepare makrut lime leaves

• For soups and curries: fold or gently crush each leaf, then tear it once or twice before adding it to the pot. Torn leaves release their oils while remaining easy to spot.
• For curry pastes: remove the tough central rib, then slice the leaf before pounding it with the other ingredients.
• For an edible garnish: remove the rib, stack the leaf halves and shred them as finely as possible. Fine threads are lovely over curries, fish cakes and stir-fries; coarse pieces can be unpleasantly chewy.

Whole or torn leaves are usually used for infusion and left to one side while eating. Finely shredded leaves are intended to be eaten.

Where to use makrut lime leaves

Add torn leaves to Tom Yum, coconut soups and curries while they simmer. Finely shredded leaves can also be stirred through a dry curry or sprinkled over a finished dish for a fresher burst of fragrance.

Why lemongrass, galangal and makrut lime leaves work together

Using all three is not simply a way to make a dish “more citrusy”. Each aromatic occupies a different part of the flavour:

• Lemongrass gives a clean, bright top note.
• Galangal provides savoury, peppery depth.
• Makrut lime leaves add a concentrated floral lift.

Together they create the recognisable aromatic structure of dishes such as Tom Yum. Chilli can then provide heat, lime juice can bring sourness, and Thai fish sauce can supply saltiness and savoury depth. These ingredients support one another, but each still has its own purpose.

Fresh aromatics or Tom Yum paste?

Both routes can produce a delicious bowl of soup; the best choice depends on the time you have and the result you want.

Starting with fresh aromatics

Bruising fresh lemongrass, slicing galangal and tearing makrut lime leaves gives you control over every layer of fragrance. It is an especially good route when you want a clear, fresh-tasting broth or when you enjoy adjusting a recipe as it cooks.

Starting with a prepared paste

A Tom Yum paste is a convenient way to bring the main seasoning together quickly. Lobo Tom Yum Paste comes in a useful small packet, while Mae Ploy Tom Yum Paste is another handy option for the cupboard.

Using a paste does not mean you have to skip fresh ingredients. Add bruised lemongrass, sliced galangal or torn makrut lime leaves to a paste-based soup when you want an extra lift of fresh aroma. Taste before adding further fish sauce, sugar, chilli or lime, because the paste has already done part of the seasoning for you.

Five common mistakes to avoid

1. Substituting ginger for galangal

They may look related, but their flavours are not the same. Use fresh galangal when galangal is the defining ingredient.

2. Trying to eat large pieces of lemongrass

Bruised chunks are designed to perfume a broth. Only very finely sliced tender lemongrass is pleasant to eat.

3. Expecting makrut lime leaves to make a dish sour

The leaves provide fragrance, not acidity. Finish with lime juice when the dish needs sourness.

4. Cutting curry-paste ingredients too large

Galangal and lemongrass are fibrous. Slice them thinly and chop them small before pounding or blending so the finished paste is smoother.

5. Treating every aromatic piece as edible

Whole leaves, large galangal slices and bruised lemongrass are often left in the bowl. That is normal: they have already done their job by flavouring the broth.

How to store fresh Thai aromatics

Keep fresh lemongrass, galangal and makrut lime leaves refrigerated, following the storage directions on the pack. Keep them dry and prepare only what you need so the remaining pieces retain their aroma.

If you have more than you can use while fresh, all three can be frozen for future cooked dishes. Trim lemongrass, slice galangal and portion the leaves before freezing so you can take out only what you need. Freezing may soften their texture, but they can still add useful fragrance to soups and curries. For the brightest aroma and for raw garnishes, use fresh ingredients where possible.

Frequently asked questions

Can I use ginger instead of galangal?

You can make a tasty dish with ginger, but it will not taste the same. Galangal has the peppery, resinous aroma that defines Tom Kha and contributes to an authentic Tom Yum fragrance.

Can you eat lemongrass?

Yes, when the tender inner core is sliced extremely finely or pounded into a paste. Large bruised pieces used in soups are too fibrous and should be moved aside or removed.

Are makrut lime leaves edible?

Finely shredded leaves are edible and often used as a garnish or stirred into a dish. Whole or torn leaves are mainly for infusion and are normally left uneaten.

Are makrut lime leaves and kaffir lime leaves the same thing?

Yes. Both names are used for the same ingredient in UK shops and recipes. We use “makrut lime leaves” in our editorial guides, although you may still see the alternative name on established packaging and product listings.

Can I use frozen aromatics?

Yes. Frozen lemongrass, galangal and makrut lime leaves work well in cooked soups and curries, although fresh ingredients usually give the brightest fragrance and best texture.

Which Thai dishes use all three aromatics?

Tom Yum is the best-known example. They may also appear together in curry pastes, fragrant broths and seafood dishes, depending on the regional and family recipe.

Bring the aroma of a Thai kitchen into your cooking

Once you know what each aromatic contributes, you can adjust a dish with much more confidence: bruise fresh lemongrass for a clean citrus fragrance, slice fresh galangal for peppery depth, and tear makrut lime leaves for a floral lift.

You can find all three in our fresh fruit, vegetables and herbs collection, ready for your next Thai soup, curry or homemade paste.