Glutinous rice (Oryza sativa var. glutinosa) is the staple of Laos, northeast Thailand, and highland Burma and northern Thailand. Its use as the daily staple (rather than the non-glutinous jasmine rice of central Thailand) reflects both agricultural availability and cultural identity. Thompson notes that the Lao and Isaan identification with sticky rice goes beyond food — it is an identity marker, expressed in the phrase 'luk khao niao' (child of sticky rice) used by Lao and Isaan people to distinguish themselves from central Thai 'luk khao jao' (children of jasmine rice).
Glutinous rice soaked overnight, then steamed over boiling water in a conical bamboo basket — a preparation of the north and northeast that produces a completely different eating experience from jasmine rice: each grain is separate but clingy, the rice pulled and torn in the fingers, shaped into small balls and used as the utensil and the food simultaneously. Sticky rice is the staple of Isaan and Lao eating, served at every meal, and it must be cooked correctly: undercooked sticky rice is chalky and hard at the centre; overcooked sticky rice is an amorphous, gluey mass. The correctly steamed sticky rice — cooked through, slightly translucent, each grain holding its shape but adhering to its neighbours — has a texture found nowhere else in the grain world.
**Ingredient precision:** - Glutinous rice: long-grain sticky rice (khao niao) — not the short-grain Japanese glutinous rice (mochigome), which has different starch characteristics and produces a different result. Thai glutinous rice is available from Thai and Southeast Asian grocery suppliers. - Soaking: minimum 6 hours; overnight preferred. The soaking hydrates the starch and reduces the required steaming time. Unsoaked glutinous rice requires 45–60 minutes of steaming; soaked rice requires 20–25 minutes. - Water: the rice is steamed over water, not cooked in water (unlike jasmine rice). The steam is the medium; the rice is above the water, not submerged. **The equipment:** - Bamboo conical basket (huad): the traditional vessel, placed over a tall, narrow pot of boiling water. The conical shape causes the steam to circulate efficiently through the rice. In the absence of a bamboo steamer, a standard metal steamer with cheesecloth lining works — but the bamboo basket is preferred for fragrance and breathability. **The preparation:** 1. Soak the rice overnight in cold water (generously — the rice expands as it hydrates and should remain submerged). 2. Drain completely. 3. Fill the pot with 5–7cm of water. Bring to a vigorous boil. 4. Place the soaked, drained rice in the bamboo basket or steamer. 5. Steam over vigorous boiling water for 10–12 minutes. 6. Turn the rice mass — lift and invert it so the bottom becomes the top. Steam for a further 8–10 minutes. 7. Test: take 3 grains and press between thumb and forefinger. They should crush to a smooth, completely cohesive paste with no hard centre — any remaining hardness means more steaming is required. Correctly cooked sticky rice is translucent throughout. 8. Remove from the steamer. Allow to rest in the basket for 2–3 minutes before serving. Decisive moment: The turning at the midpoint. The steam in a bamboo basket circulates from the base upward — the lower half of the rice mass cooks faster than the top. Turning at 10–12 minutes ensures even cooking throughout. Skipping the turn produces sticky rice that is correctly cooked at the base and undercooked at the top — the classic failure of home preparations. Sensory tests: **Sight — the translucency test:** Correctly cooked glutinous rice is translucent — each grain has changed from opaque white (raw) to a semi-translucent, slightly shiny appearance that indicates full starch gelatinisation. Hold a grain up to the light: it should transmit light rather than blocking it completely. Opaque white grain at the centre: needs more steam time. **Feel — the squeeze test:** A correctly cooked sticky rice grain pressed between thumb and forefinger crushes to a smooth paste immediately and completely. Any gritty resistance in the crushed grain: undercooked. **Touch — the eating temperature:** Sticky rice is best served at the temperature it comes from the steamer — warm, pliable, fragrant. As it cools, the starch retrogrades (returns to a firmer structure) and the rice becomes denser and harder to form into balls. Reheat in the steamer for 3–4 minutes to restore the correct pliability if the rice has cooled.
- Sticky rice kept warm in the bamboo basket (covered, off heat) holds correctly for up to 30 minutes - For restaurant service: keep sticky rice in the basket set over a bain-marie of hot water — the steam continues to maintain its texture without additional cooking - Sticky rice is the base for mango sticky rice (khao niao mamuang) — the dessert of sweet, warm sticky rice dressed with coconut cream and palm sugar, served with ripe mango. A dish whose cultural significance in Thailand is comparable to crème brûlée in France.
— **Hard, chalky centre:** Insufficient soaking time or insufficient steaming time. Both are required. — **Gluey, formless mass:** Over-steamed — the starch has gelatinised to the point where the individual grain structure is lost. Serve immediately upon completion; do not leave covered. — **Uneven cooking (top hard, bottom perfect):** The turn was not executed. This is the most common failure.
David Thompson, *Thai Food* (2002); *Thai Street Food* (2010)