Sikhye — Sweet Rice Drink and Nurungji Fermentation (식혜)

Ingredients

• 200 g yeotgireum, malted barley; soaked in cold water, squeezed, and strained to yield malt water
• 1 litre cold water, for soaking the yeotgireum
• 300 g short-grain white rice, cooked then cooled to 60°C before use
• 50 g sugar, adjusted to taste before the final boil
• To serve
• 1 tbsp pine nuts, floated on each bowl
• 4 jujube, pitted and sliced; optional garnish

Method

1. 1
   Soak the yeotgireum in the cold water for 30 minutes. Work the grains firmly with your hands, then strain through muslin, squeezing until the liquid runs almost clear. Discard the spent grain. The malt water should appear pale amber and feel faintly viscous between the fingers.
2. 2
   Cook the rice until fully tender, then spread it out and allow it to cool until a thermometer reads 60°C at the centre of the mass. Do not add the malt water until this temperature is confirmed. Rice hotter than 65°C will denature the amylase enzymes on contact, and no amount of subsequent holding time will recover saccharification.
3. 3
   Combine the cooled rice and the malt water in a wide-mouthed insulated vessel — a rice cooker on its 'warm' setting, or a Styrofoam cooler with a jar of near-boiling water set alongside the container, both sealed. The mixture must be held between 55°C and 65°C continuously for 4 to 6 hours. A drop below 50°C stalls the enzymes; the sikhye will remain starchy and flat. This is where the dish lives or dies: sustained temperature across the full holding period determines whether enzymatic saccharification completes and natural sweetness develops.
4. 4
   At intervals, observe the surface. Saccharification is complete when the majority of rice grains float freely to the top. Grains still settled at the bottom indicate incomplete starch conversion; continue holding and check again at 30-minute intervals.
5. 5
   Transfer the liquid and floating grains to a saucepan. Add sugar to taste. Bring to a full boil and maintain for 5 minutes, stirring occasionally. This arrests enzyme activity and fixes the sweetness level. Without this step, continued conversion over-thins the liquid. The surface will foam lightly and the steam will carry a clean, faintly malty sweetness.
6. 6
   Remove from heat. Cool to room temperature, then refrigerate until thoroughly cold. The finished sikhye should be pale straw in colour, limpid, and taste cleanly sweet with a faint rice character and no residual starchiness. Serve ice-cold with floating rice grains, pine nuts, and jujube.