Cooking in
Nelson · the Kootenays
Thai · Northern Thai
Khao Niaw Dum — Black Sticky Rice Fermented / ข้าวเหนียวดำหมัก
Fermented black sticky rice (for khao mak dum) is a lactic-fermented sweet made by steaming black glutinous rice, cooling completely, mixing with a rice wine starter (look pang khao mak), and fermenting sealed for 3–5 days. The fermentation produces a sweet, slightly alcoholic, tangy product — the starch converts to sugars and the lactic bacteria produce a clean, pleasant sourness. The result is eaten as a dessert or snack, served in its own sweet fermentation liquid. Unlike the black rice dessert cooked in coconut milk, khao mak dum is alive in the sense that it is an ongoing fermentation product.
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- 2 · black glutinous rice, look pang khao mak (rice wine starter)
I
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500 g
Black glutinous rice
rinsed and soaked overnight
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5 g
Look pang khao mak (rice wine starter)
finely crumbled; approximately 1% by weight of rice
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The Method
1
Drain the soaked black glutinous rice and steam over boiling water for 40–50 minutes, turning the rice once at the halfway point so the grains on the outside do not overcook while those in the centre remain hard. Steam until every grain is fully tender and translucent through to its centre. Test by pressing a grain between the fingers: it should offer no chalky resistance.
From the canon — Glutinous rice — called sticky rice (khao niew) in Isaan and northern Thai — is a different grain from jasmine rice, with a different starch structure (almos… Glutinous Rice / Sticky Rice (Khao Niew): Soaking and Steaming →
2
Spread the cooked rice in a thin, even layer on a clean tray or board, leaving it uncovered so moisture escapes evenly rather than condensing back into the rice. Leave at room temperature until completely cool — not merely warm but genuinely cold to the back of the hand. This is where the dish lives or dies: any residual heat above ambient temperature when the starter is added will kill the yeast and lactic bacteria, and the fermentation will not proceed.
3
Crumble the look pang evenly over the cooled rice and fold through with a clean spoon or hands, working deliberately so the starter reaches every part of the mass and leaves no dry pockets, since an uneven distribution will give you patches that ferment and patches that do not. The rice should show a faint, starchy, faintly yeasty smell at this stage — no sourness yet.
4
Pack the inoculated rice firmly into a clean, dry, airtight vessel, pressing out air pockets as you go so the grains sit in close contact and the starter can travel through the mass evenly. Seal completely with minimal headspace, because oxygen at the surface encourages off-flavours rather than the clean, sweet fermentation you are after.
5
Ferment the sealed vessel at 30–35°C, a temperature warm enough for the starter to work at a steady pace without driving the fermentation so fast that harsh, vinegary notes develop before sweetness has fully built. At 3 days, open and assess: the rice will have softened further and a sweet, slightly alcoholic liquid will have accumulated around the grains, and the aroma should be clean, sweet, and faintly lactic. For a mildly sweet result, stop here; for a more complex, sour flavour with greater alcoholic depth, reseal and continue for a further 2 days, tasting at intervals as the sweetness diminishes and acidity builds.
6
Serve the fermented rice at room temperature or lightly chilled, with its accumulated fermentation liquid poured over. The liquid is sweet, slightly cloudy, and drinkable alongside.
III
Quality Hierarchy
01
Reserve — Heirloom black glutinous rice from a named Northern Thai or Isaan source, freshly milled; look pang from a specialist Thai fermentation supplier or made to a traditional formulation.
02
Estate — Thai black glutinous rice purchased from a Thai grocery, clearly labelled for glutinous use; look pang sourced from a Thai or Southeast Asian provisions store.
03
Market — Commercially packaged black sticky rice available in Asian supermarkets; standard look pang from the same source, checked for freshness by smelling for clean, yeasty notes.
04
House — Any black glutinous rice and look pang available — fermentation will proceed, though the depth of flavour and the complexity of the lactic sourness will be less pronounced.
IV
Sensory Tests
◇Touch. Cooked rice grains are fully tender with no chalky core when pressed between the fingers.
◇Touch. Cooled rice registers as genuinely cold — not warm — against the back of the hand before the starter is added.
◇Smell. After sealing, the opening at day 3 reveals a clean, sweet, faintly alcoholic and lactic aroma; any sharp, putrid, or mouldy note indicates contamination and the batch must be discarded.
◇Sight. Sweet, slightly cloudy liquid accumulates visibly around the grains by day 3, confirming active fermentation.
◇Where it lives or dies. The rice must be completely cool — not merely warm — before the starter is added; any residual heat kills the yeast and lactic bacteria and fermentation cannot proceed.
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VI
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