Thai Green Curry Paste (Prik Gaeng Khiao Wan)

The one everybody gets backwards. In Thailand green curry is normally HOTTER than red — the Western intuition reads the traffic light the wrong way round. Red paste uses dried long red chilies, soaked, and drying rounds the heat off and deepens it. Green paste uses fresh green bird’s eye chilies pounded in raw, and fresh heat arrives sharp, bright and immediate. Traditional red paste contains no fresh chilies at all.

The other thing the name gets blamed for: khiao wan translates literally as “sweet green,” and every English menu that renders it “sweet green curry” invites you to expect something mild. Wan there is describing the SHADE — the soft pale green the curry goes once the paste meets coconut milk. It is a colour word doing colour work. The curry is hot.

Written to be made rather than transcribed from long practice — my file has leaned on tubs. The reasons are given so you can judge each step.

Ingredients

The chilies — this is the whole difference

• 15-25 fresh green Thai bird’s eye chilies (phrik khi nu), stems off, seeds in
• 5 fresh green long chilies, for bulk and colour without proportional heat

The pounding set

• 1 Tbsp coarse salt
• 3 stalks lemongrass, pale lower third only, sliced very thin across the grain
• 2 in / 5 cm galangal, peeled and sliced thin
• 8 cloves garlic
• 6 Thai shallots (or 3 regular), sliced
• 2 Tbsp coriander root, chopped, plus a small handful of coriander stem
• 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

Directions

Key ingredients

Fish Sauce · Black Pepper · Salt · Shrimp Paste

1. No soaking here. Unlike red, everything green goes in fresh. Just stem the chilies and roughly chop the long ones.
2. Toast the dry spices in a dry pan over medium heat 1-3 minutes until fragrant, tip them straight out of the pan, cool and grind. Toast the shrimp paste wrapped in foil, 2 minutes a side.
3. Pound in order — hardest and driest first. Salt first, as an abrasive. Then the ground dry spices and peppercorns. Then the tough fibrous group: lemongrass, galangal, makrut zest, coriander root. Give this ten to twenty minutes and do not hurry it.
4. Then the chilies, which break down fast and will splash — a hand over the mortar helps. Then garlic and shallot. Then the coriander stem and leaf. Shrimp paste last.
5. Doneness is by feel: rub a pinch between finger and thumb and there should be no fibres and no grit.
6. Cooking it — crack the cream first. Do not shake the can. Spoon the thick cream off the top, bubble it alone 5-10 minutes until a clear oil separates, and fry the paste in THAT fat for 2 minutes before adding the rest of the milk. This is the step that separates a good green curry from an average one, and most published recipes skip it in favour of frying in neutral oil and then pouring in a whole can.
7. Use less liquid than you think. Green curry should be loose but not soupy. One can of coconut milk, cracked, is usually right for a pound and a half of chicken — broth only if it genuinely needs it.
8. Finish off the heat with fish sauce, palm sugar, torn makrut leaves and a generous handful of Thai basil stirred in to wilt. Those herbs are volatile; boiled for five minutes they have given up.

Notes

The colour will fade, and that is normal Green paste browns and dulls with heat and with time. A homemade batch will be a duller, greyer green within days in the fridge — that is oxidation, not spoilage, and the flavour holds far longer than the colour does. Freeze it if you want the colour to hold. Conversely, a commercial green paste still vivid emerald after a year in a tub has usually had help.

Why green is the hot one, stated plainly Fresh green bird’s eye chilies are simply hotter than the dried spur chilies in a red paste, and going in fresh rather than dried the heat is sharper and more immediate. Worth knowing that export and Western-market RED pastes are often built with fresh red chilies like cayenne, which pushes red’s heat up and blurs the distinction — so “red is hotter” can be true of two jars in an American supermarket and false of the same two curries cooked in Bangkok.

What to put in it Chicken is standard; fish balls (luk chin pla) are the common street version. Thai eggplant — the small round green ones — and pea eggplant, which are bitter little pellets and are supposed to be. Bamboo shoots. Very good over khanom chin, fermented rice noodles, which is how a lot of Thailand actually eats it.

Vegetarian Swap the shrimp paste for fermented soybean paste or miso plus salt, and use soy or a vegan fish sauce in place of nam pla.

Storing Fridge two weeks under a film of oil; freezer six months in ice-cube-tray portions.