Cooking in
British Columbia
Thai · Central Thai
Khao Tom Pu — Crab Rice Porridge / ข้าวต้มปู
Khao tom pu (crab rice soup) is the premium version of the standard Thai rice porridge — fresh crab (typically mud crab, Scylla serrata) is used to make the broth rather than pork bones, and the crab meat is added as the protein. The broth is made by simmering the whole cracked crab carcass (without meat) in water with coriander root, white pepper, and garlic for 30 minutes to extract flavour, then strained. The rice is cooked in this crab broth, and the fresh crab meat (extracted from the claw and body) is added at the last moment. The result is rice porridge with an intensely sweet crab-infused base and fresh crab texture — a completely different category from pork khao tom.
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Cook
I
The Market List
The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.
1 (about 800 g)
Mud crab (Scylla serrata), live or very fresh
carcass cracked and reserved; claw and body meat extracted and refrigerated
Not yet stocked in British Columbia
For the crab broth
1.5 litres
Water
Your own market
3 roots
Coriander root
lightly bruised
Not yet stocked in British Columbia
1 tsp
White pepper
whole or coarsely cracked
Your own market
4 cloves
Garlic
lightly bruised
Your own market
For the porridge
200 g
Jasmine rice
rinsed
Your own market
2 tbsp
Fish sauce
plus more to adjust at service
Your own market
½ tsp
White pepper
ground
Your own market
For the garnish
3 tbsp
Fried garlic
thinly sliced and fried until golden
Your own market
30 g
Fresh ginger
peeled and cut into fine julienne
Origin · New ZealandNot yet stocked in British Columbia
3 stalks
Green onion
finely sliced
Your own market
II
The Method
1
Crack the crab carcass — shells, legs, and all shell fragments — into manageable pieces, so that the broken surfaces release their flavour directly into the water rather than seeping slowly through intact shell. Extract all claw and body meat cleanly and refrigerate it. Place the cracked carcass in a pot with the water, coriander root, bruised garlic, and whole white pepper, bring to a simmer over medium heat, and simmer for exactly 30 minutes — no longer, because beyond that point the broth turns dull and faintly bitter where it should remain clean and sweet. The broth is ready when it runs a clear, pale amber and carries a clean, sweet marine scent.
From the canon — The root and lower stem of the coriander plant (Coriandrum sativum) — an aromatic that Thompson identifies as the most overlooked and underutilised Thai ingr… Coriander Root (Raak Pak Chee): The Overlooked Element →
2
Strain the broth through a fine sieve, discarding all solids, then return the strained broth to the pot and bring it back to a gentle simmer. Add the rinsed jasmine rice — rinsed so the excess surface starch does not make the porridge gluey and opaque — and cook, stirring occasionally, until the grains have fully softened and the porridge has reached a thick, flowing consistency, approximately 25 to 30 minutes. The surface should move in slow, heavy rolls when stirred.
From the canon — Thai jasmine rice — khao hom mali (fragrant jasmine rice) — cooked by the absorption method: precisely measured rice washed to remove surface starch, combine… Jasmine Rice (Khao Hom Mali): The Absorption Method →
3
Season the porridge with fish sauce and ground white pepper, keeping in mind that the rice will have absorbed a considerable amount of salt during cooking, so begin with less than you think you need and build upward. This is where the dish lives or dies — taste critically and adjust with additional fish sauce until the broth tastes forward and savoury, with the crab's natural sweetness still distinct beneath, because an under-seasoned broth renders that delicate sweetness invisible while an over-salted one destroys it entirely.
From the canon — Fish sauce — nam pla — is the universal salt of the Thai kitchen. Fish Sauce (Nam Pla): Selection and Use →
4
In the final 3 minutes before service, fold the reserved fresh crab meat gently into the hot porridge — gently, so the pieces remain in recognisable, tender morsels rather than breaking down into the body of the rice. The meat is done when it has just turned opaque and yielding; remove from heat immediately, because even a minute more will cause it to tighten and lose the soft, sweet texture the dish depends on.
5
Ladle into warmed bowls and finish each portion with fried garlic, ginger julienne, and sliced green onion. Serve at once, as the crab meat continues to cook in the residual heat of the porridge.
III
Quality Hierarchy
01
Reserve — Live mud crab (Scylla serrata) of 800 g or more, dispatched to order; the entire animal yields a broth of extraordinary sweetness and meat of pure, uncomplicated flavour.
02
Estate — Very fresh whole mud crab purchased the same morning from a coastal or wet market; chilled but never frozen, with bright, firm meat and intact, fragrant shells.
03
Market — Fresh whole crab of another species — blue swimmer or similar — sourced the same day; the broth will be lighter and less sweet, but the technique remains sound.
04
House — Pre-picked fresh crab meat with a good-quality commercial fish stock as the broth base; acceptable as a weekday preparation, but the two-stage crab technique — shells for broth, meat for service — is lost, and with it the dish's defining character.
IV
Sensory Tests
◇Smell. After 30 minutes, the crab broth smells clean and sweetly marine — not bitter, not dark; if any bitterness enters the aroma, the carcass has simmered too long and the broth should be discarded.
◇Sight. The strained broth runs a clear pale amber with no cloudiness or dark sediment.
◇Sight. The porridge moves in slow, heavy rolls when stirred — the rice grains are fully soft and the consistency is thick and flowing, neither watery nor set.
◇Sight. The folded crab meat has turned just opaque throughout, with no translucency remaining; any further cooking tightens the fibres irreversibly.
◇Where it lives or dies. The dish lives or dies at seasoning: the rice absorbs aggressively during cooking, and the broth must be adjusted to carry the crab's natural sweetness forward without either flatness or excess salt obscuring it.
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VI
What to Pour
The pairing
Sparkling wine
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The working kitchen