Jasmine Rice (Khao Hom Mali): The Absorption Method

Thai jasmine rice has been cultivated in the Thung Kula Rong Hai plain of northeastern Thailand and surrounding regions for centuries. Its distinctive fragrance — from 2-acetyl-1-pyrroline — is a genetic characteristic of the variety that degrades with age and storage: rice that is less than 6 months from harvest (considered 'new rice' in the Thai market) is most fragrant. The absorption method of cooking is the standard throughout mainland Southeast Asia.

Thai jasmine rice — khao hom mali (fragrant jasmine rice) — cooked by the absorption method: precisely measured rice washed to remove surface starch, combined with precisely measured water, brought to a simmer, covered, and cooked until all water is absorbed. The result: each grain distinct, slightly sticky (not separated and dry as in pilaf), with the characteristic jasmine rice fragrance — 2-acetyl-1-pyrroline, the same compound that gives basmati its aroma — fully expressed in the steam released when the lid is removed. Rice is the centre of every Thai meal — the dishes are the accompaniments. The quality of the rice preparation determines the quality of the meal.

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Thai jasmine rice's aromatic compound (2-acetyl-1-pyrroline) is unusual in that it is present in the grain as a precursor that converts to the aroma compound during cooking. As Segnit notes, this compound appears in a surprisingly broad range of foods — basmati rice, fresh bread crust, cooked corn, and certain roasted grains — and its presence in jasmine rice places it in an aromatic family that triggers associations of warmth, comfort, and freshness simultaneously. The slight stickiness of Thai jasmine rice (from its amylopectin-to-amylose ratio — higher amylopectin than most long-grain rices) is not a defect but a designed quality: it makes the rice adhesive enough to eat with the fingers and to scoop sauce and curry, while remaining sufficiently distinct-grained to be pleasant in texture.