Sarim (ซ่าหริ่ม)

The Dessert Made of Threads

ซ่าหริ่ม — also written สลิ่ม (salim) — is one of the oldest sweets in the Thai repertoire. Mkunigroup's food historians note the record is not precise, but Ayutthaya knew the dish by the late period of the old capital, and some sources put it among the sweets credited to ท้าวทองกีบม้า — Marie Guimar, the Portuguese-Japanese confectioner at the Ayutthaya court known as the queen of Thai desserts, creator of thong yip and thong yod.

The dessert is, at its core, two things: threads and cream. The threads are made from แป้งถั่วเขียว, dehulled mung bean flour — nothing else binds them — stirred over heat with jasmine-flower water (and pandan for the classic green) until the paste turns clear, then pressed through a ที่กดซ่าหริ่ม, a hand press with fine holes, into a bowl of ice-cold water. The cold sets each strand instantly. Wongnai's home cook Nickktwf puts the difference from its famous cousin plainly: the method is lod chong's, but the flour and the press are not — sarim's threads are finer, shorter and silkier.

The cream is sweetened coconut cream, and the finishing touch of the old recipes is อบควันเทียน — a jasmine-scented candle burned inside the covered pot until the smoke perfumes the syrup. Phol Food Mafia and TrueID both smoke theirs; Krua.co treats it as optional polish. Either way, the last ingredient is non-negotiable: crushed ice. Sarim is a hot-weather sweet, eaten cold, and the ice is part of the recipe, not the garnish.

The Recipe (home version, from Krua.co / Phol Food Mafia)

The three-colour set (Kapook): the same paste made three times — green with pandan water, pink with rose syrup or pink colouring in jasmine water, white with plain jasmine water — served together in one cup. The natural-colour set (TrueID): pandan green, butterfly pea blue and bougainvillea pink, each 550 g of boiled-and-strained flower water to 60 g of flour, with ¼ teaspoon of jasmine essence — no artificial colour at all. The no-frills pot (Wongnai): flour and jasmine water at a stiff 1 : 2.5 ratio with food colouring, stirred on a high flame until clear — the quickest version, and the one that proves the dish.

The Method

1. The jasmine water. The evening before, float jasmine buds on a jug of water, cover and leave overnight — Phol picks the buds tight at six in the evening and strains them out in the morning. A drop of jasmine essence in cold water is TrueID's shortcut.
2. The pandan water. Blend pandan leaves with some of the jasmine water and strain hard. The green of the threads comes from this, and so does their scent.
3. The paste. Stir the flour into the pandan water until it dissolves with no lumps, then cook it in a pan over a low-to-medium flame. Kapook's rule: stir one direction only, and the paste stays smooth. After 9 to 15 minutes it turns translucent and glossy and pulls away from the pan. Krua's readiness test: drop a little into cold water, wait five minutes, pinch it — if it holds its shape instead of dissolving, the paste is ready.
4. The press. Fill a tall bowl with ice-cold water — Krua insists the ice be fully melted first, because paste landing on an ice cube sets lumpy instead of stranding. Hold the sarim press about 15 cm above the surface and press the hot paste through in strands about 2 inches long. Leave the threads in the cold water 5–10 minutes to firm, then lift them into a sieve to drain.
5. The coconut syrup. Dissolve the sugar in jasmine water and simmer to a light syrup, then stir in the salted coconut cream off the heat. Both Krua and Kapook simmer the sugar first and add the cream after — heated too hard, coconut cream splits, and the syrup turns grainy.
6. The candle smoke. If you want the old-court perfume: light the scented candle, blow it out, and set it in a small dish inside the pot with the syrup, lid on. Phol smokes it for an hour; TrueID lights it straight in the coconut pot. Skip it and the dessert still works.
7. The serve. Chill the syrup, spoon the threads into cups, pour the coconut cream over and crown with crushed ice. Eat it before the ice melts — the balance depends on the cold.

Where Thai Sources Disagree

How Western Versions Get It Wrong

• Reaching for the pandan essence bottle. TrueID boils real leaves, real butterfly pea and real bougainvillea. Pandan essence colours and fakes the scent; blended fresh leaves — or frozen ones — carry both, and that is the point of the dish.
• Boiling the coconut cream. Simmer the sugar syrup first, add the cream off the heat. Boil them together and the cream splits into grainy curds — the classic failure, and both Krua and Kapook warn against it.
• Pressing into icy water, ice cubes included. Krua is explicit: melt the ice first. A hot thread hitting an ice cube sets into a lump instead of a strand.
• Making it with rice flour. That is lod chong. Sarim is mung bean flour alone — finer, softer threads, and a different press. Swap the flour and you have made the cousin, not the dish.
• Skipping the setting soak. Threads pressed and served straight from the water dissolve into the syrup. The five-to-ten-minute rest in the cold water is what fixes the strands — the texture is built there, not in the pan.
• Serving it warm, or skipping the ice. Sarim is a refreshment. The crushed ice is structural: it keeps the cream cold and thins it just enough to drink the last of it. Warm, it is a different, sadder dessert.

UK Ingredient Notes

• Mung bean flour (แป้งถั่วเขียว): labelled mung bean flour or green bean flour in Thai and Chinese supermarkets — make sure it is dehulled (pale) starch, not whole-bean flour.
• Sarim press (ที่กดซ่าหริ่ม): Thai grocers sell the tin press; online Thai supermarkets stock them too. Fallbacks: a piping bag with a small round nozzle, or a potato ricer with the fine disc — strands come out a little shorter, which is fine.
• Pandan leaves: fresh at Thai grocers, frozen year-round; blend with water and strain hard for the colour.
• Jasmine water: float jasmine flowers from a florist or garden overnight; alternatively a drop of jasmine essence in cold water (TrueID's shortcut).
• Scented candle (เทียนอบ): jasmine-scented Thai candles at Thai grocers; the step is optional, so skip it rather than substitute a random candle.
• Butterfly pea flowers: dried, from tea shops or online — for the natural blue version. Bougainvillea for pink is trickier in the UK; a drop of pink colouring is the honest fallback.
• Coconut cream: full-fat tinned cream (or the thick top of a full-fat coconut milk tin).

Sources

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