Kaeng Kradang (แกงกระด้าง)

The Curry That Uses Winter As An Ingredient

กระด้าง means hard, stiff, set — and the name is the recipe. Chiang Mai University's culture encyclopedia explains the logic: Lanna winters are cold enough that a pot of thick trotter curry left out overnight sets by itself, the natural gelatine from pork skin and sinew doing the work no refrigerator was needed for. The dish appears on the winter ขันโตก table from December through to the second and third lunar months, and morning markets sell it in slabs, sliced to order.

The northern name is แก๋งกะด้าง — Toke-Tong, the Chiang Rai restaurant, notes that northern Thai has no r or l consonant clusters, and the local nicknames drift through แกงด้าง, หมูกระด้าง and หมูหนาว ("cold pork"). Krua.co's food story puts it plainly: a dish called a curry with no broth to sip, cut into wobbly blocks like a western jelly, but with pork and skin suspended through it.

Children of Chiang Mai even sang it: "แก๋งขะด้าง ขี้ก้างป๋าดุก แก๋งบ่สุก เอามาฮากไก้" — roughly, "hard-set curry with catfish bones in it, if it hasn't set, give it to the chickens." The rhyme is a recipe in itself: if the curry will not stiffen, it has failed.

The Recipe (Chiang Mai style, from Toke-Tong / CMU Encyclopedia)

The Chiang Rai pot (CMU Encyclopedia): the paste turns orange — dried chillies soaked and pounded with lemongrass, galangal, garlic, shallots and shrimp paste; the trotter is singed, scraped and boiled first with salt and coriander root, then chopped small and returned with the paste, simmered until the sauce reduces "like tar" (ยางมะตูม) before it is poured out to set. The shortcut pot (Wongnai, ปีศาจหมู): pork marinated in lime or pineapple juice to tenderise, a tablespoon of ready-made northern chilli paste mixed with pounded coriander root and peppercorns, boiled in a cup of water, salted, and refrigerated overnight in a sealed box. The restaurant pot (Toke-Tong): 300 g trotter, 20 cloves garlic, half a tablespoon of peppercorns, three coriander roots — simmer one hour, add the pounded paste and salt, pour into a tray and set.

The Method

1. The trotter. Singe and scrape the skin clean — Toke-Tong's tip is to burn it lightly over flame first so the hairs lift. Debone and chop meat and skin small.
2. The simmer. Simmer the trotter in water over low heat, about an hour, until tender. The skin is what releases the gelatine — do not rush this step.
3. The paste. Pound the garlic, peppercorns and coriander roots fine. The Chiang Mai encyclopedia version adds onion and shrimp paste to the pound, and kneads the raw paste into the chopped meat before cooking, simmering until the oil splits (แตกมัน) before adding water.
4. The season. Stir the paste into the pot with the salt and cook a few minutes more. Taste — the finished jelly needs to carry the seasoning, because it will be eaten cold.
5. The set. Pour into a tray or dish, cool, and refrigerate overnight. Wongnai's cook keeps hers in a sealed box and slices it out with a knife.
6. The serve. Cut into blocks, scatter over chopped coriander and spring onion, and eat cold — with sticky rice or as part of the winter khantoke spread.

Where Thai Sources Disagree

How Western Versions Get It Wrong

• Serving it hot. Kaeng kradang is a cold dish — the jelly is the point. Heat it and you have unravelled it back into an ordinary curry.
• Powdered gelatine as the first resort. The set should come from the trotter's own skin and sinew; CMU mentions agar as a modern helper for cooks in a hurry, not the foundation. A western version built on gelatine powder with a token of pork has skipped the dish.
• Boiling instead of simmering. A hard boil breaks the broth and clouds the jelly. Every source simmers low — Toke-Tong an hour, CMU "until tender" — because clarity is what the finished slice shows.
• Leaving out the skin. Lean pork will not set. The skin is the gelatine factory; the trotter is chosen precisely because it has sinew and skin in the right ratio.
• Treating it as aspic with vegetables. Thai sources put nothing in the jelly but pork, paste and seasoning — no carrots, no peas, no herbs suspended in the block. The garnish is coriander and spring onion scattered on top at serving.

UK Ingredient Notes

• Pig trotters: any butcher will order them; Chinese supermarkets stock them fresh and frozen. Ask for them split if you want less knife work.
• Coriander roots: attached to the whole plants at Thai grocers; in a pinch, chopped coriander stems carry most of the flavour.
• Shrimp paste (กะปิ): jars at Thai grocers, for the Chiang Mai paste.
• Agar powder, if you want the guaranteed set: any Asian grocer; dissolve a little in the hot curry before pouring, the CMU way.
• The set needs nothing special in a UK kitchen — refrigerate overnight in a tray or loaf tin, then slice like a terrine.

Sources

This recipe is translated from the following Thai-language sources. Where they disagree, we've said so.