Thai Red Curry Paste (Prik Gaeng Phet)

This is the trunk of the Thai curry family, and the one to learn first — change one thing about it and you have yellow, panang or khua. Thai is my favourite of all the curries, and the reason is that the system has more internal logic than any of the others: the paste is not an ingredient in the recipe, the paste IS the recipe, and everything after it is assembly.

What makes it red is dried red chilies, soaked. That is more specific than it sounds, and it is the whole difference from green — dried chili reads rounder and deeper on the palate than fresh, which is why red is usually the MILDER of the two despite what the colour suggests.

Honest note: this is written to be made, not written up from a batch I have been making for years. My collection has leaned on tubs for a long time. The method here is the traditional mortar one and the reasons for each step are given so you can judge them.

Ingredients

Dried chilies

• 10-12 large dried red chilies (Thai phrik chi fa haeng, or guajillo/New Mexico for colour with little heat)
• 5-10 dried Thai bird’s eye chilies, to taste — this is where the heat lives

The pounding set

• 1 Tbsp coarse salt (an abrasive as much as a seasoning — do not skip)
• 3 stalks lemongrass, pale lower third only, sliced very thin ACROSS the grain
• 2 in / 5 cm galangal, peeled and sliced thin (NOT ginger — see Notes)
• 8 cloves garlic
• 6 Thai shallots (or 3 regular shallots), sliced
• 2 Tbsp coriander root, chopped — or the lower stems if you cannot get roots
• 1 Tbsp makrut lime zest, finely chopped
• 1 tsp white peppercorns

Dry spices, toasted

• 1 Tbsp coriander seed
• 1 tsp cumin seed

Last in

• 1 Tbsp shrimp paste (kapi), toasted — see Notes for the vegetarian route

Directions

Key ingredients

Fish Sauce · Black Pepper · Salt · Shrimp Paste

1. Prepare the chilies. Stem them, and decide about seeds — the seeds and especially the pale internal membrane carry most of the heat, so removing them lets you use MORE chili for colour and body without the dish becoming unbearable. Soak in warm water 20-30 minutes until pliable, then squeeze them properly dry. Wet chilies make a wet paste that will not fry.
2. Toast the dry spices. Dry pan, medium heat, moving constantly, 1-3 minutes until they smell and darken slightly. Tip them out of the pan the moment they are done — the pan keeps working. Cool, then grind.
3. Toast the shrimp paste. Wrap the lump in foil and toast in a dry pan 2 minutes a side, or hold it over a flame. Raw kapi is aggressive; toasted it mellows dramatically. This step is traditional and it is worth doing.
4. Now pound, hardest and driest first. Salt into the mortar first. Then the ground dry spices. Then the drained chilies. Then the tough fibrous group — lemongrass, galangal, makrut zest, coriander root, white peppercorn — and this is the long stretch, ten to twenty minutes. Do not move on while you can still feel fibres.
5. Then the soft things. Garlic and shallot come apart quickly. Shrimp paste goes in last and only needs incorporating — it is already a paste.
6. Test it. Rub a little between finger and thumb. No fibres, no grit, no identifiable pieces. If you can feel strands, keep going. A blender cuts where a pestle crushes, which is why the mortar version is smoother, more concentrated and does not leave lemongrass in your teeth.
7. To cook a curry with it — and this is the step most Western recipes skip. Open a can of full-fat coconut milk WITHOUT shaking it. Spoon the thick cream off the top into the pan alone and let it bubble 5-10 minutes until it thickens, goes grainy, and a clear oil separates at the edges. That is the crack — taek man, “the fat breaks out.” Fry the paste in THAT oil for 2 minutes until it darkens and smells cooked, then add the rest of the milk, the protein and the seasoning. The flavour compounds are fat-soluble; fried in coconut fat they distribute through the whole dish instead of staying locked in the paste.
8. Season at the end, off the boil, with fish sauce, palm sugar and lime or tamarind — and taste it against rice, not off a spoon. A curry that tastes right alone is under-seasoned for the rice it is served over.

Notes

What this is for Red paste is the base the rest of the family is built from. Add turmeric and Indian dry spice and you have yellow. Add ground roasted peanuts and reduce it hard and you have panang. Take the dry spice out and you have kaeng khua, used with pineapple and seafood. Take the coconut milk out entirely and add more chili and wild herbs and you have kaeng pa, jungle curry.

Galangal is not ginger This is the single most common substitution recommended online and the one I would push back on hardest. Galangal is sharper, piney, almost medicinal; ginger is warm and sweet. Swapping it does not make a slightly different red curry, it makes a different dish.

Coriander ROOT Western recipes almost always omit it and Thai cooks consider it essential — earthier and more savoury than the leaf. If your grocer trims the roots off, the lower stems are a fair stand-in. The leaves are not.

Makrut, not the other word These leaves and limes are still widely sold under a name that is a serious racial slur in southern Africa. The trade has been moving to makrut (from the Thai) for years. Three recipes in this collection still carry the old word and one already says makrut; that inconsistency is mine and it is on the list to fix.

Making it vegetarian Shrimp paste is what gives a Thai paste its savoury backbone, so leaving it out leaves a hole. Replace it with a spoon of fermented soybean paste or a good miso plus extra salt. It is not the same and it is much closer than nothing.

Storing it Fridge in a jar with a film of oil on top, about two weeks. Better: freeze it in an ice-cube tray, then bag the cubes — six months easily, and a cube goes into the pan straight from frozen. A thicker paste keeps better than a wet one, which is one more argument for the mortar.

If you are buying instead No shame in it; Thai cooks buy paste and every market in Thailand sells it fresh by weight. Read the ingredient list: a good paste reads like a recipe, a weak one reads like a formula. Where water or sugar is in the top three, put it back.