Sua Chua Nep Cam
“Hanoi cafe specialty of homemade condensed-milk yogurt layered with fermented black sticky rice (com ruou nep cam) — probiotic-tangy yogurt, chewy fermented rice, faint rice-wine aroma.”
Where it comes from
Homemade yogurt arrived in Vietnam via French dairy culture — yaourt — and was indigenised with condensed milk in place of cream because fresh dairy was scarce. Com ruou (rice-wine fermented sticky rice) is much older, a Northern Vietnamese harvest food eaten at Tet Doan Ngo (the fifth day of the fifth lunar month) to symbolically clear parasites. Hanoi cafes in the 1990s-2000s combined the two — yogurt's French dairy tang against indigenous fermented rice — creating a textural mash-up that became a Hanoi cafe staple before spreading south.
On the plate
The yogurt is denser and sweeter than Greek-style — condensed milk does that — with the live-culture tang underneath. Spoon down through the white and you hit purple-black grains that pop slightly between teeth, swimming in a clear, faintly alcoholic sweet-wine liquid. The temperature contrast — cold yogurt, room-temp rice — is half the pleasure. Faint earthy nuttiness from the black rice, faint rice-wine warmth from the yeast. Often eaten as a 4pm cafe break in Hanoi rather than as dessert.
How it works
Two fermentations on top of each other. The yogurt uses lactic-acid bacteria (Lactobacillus, Streptococcus) at 40-43°C — milk sugars become lactic acid, pH drops to ~4.5, casein gels. The black rice uses men ngot, a Vietnamese rice-wine yeast that combines mould (Aspergillus oryzae or similar) and yeast: the mould breaks rice starch into sugar, the yeast turns sugar into alcohol. Stop at 36-48 hours — go longer and it becomes proper rice wine; stop earlier and the sugar conversion is incomplete. The two ferments don't interact in the cup but they balance — yogurt's lactic tang and rice's wine sweetness sit at opposite poles of the same fermentation map.
Two ferments stacked — French yaourt with Vietnamese condensed-milk substitution, plus com ruou (men ngot rice yeast) at 36–48 hours. Hanoi cafes pinned the combination in the 1990s.
Variations
Hanoi cafe-style serves it 4pm in a tall glass; Saigon vendors thin it with crushed ice and lengthen with coconut; the diaspora version in Westminster, California adds taro and pandan jelly.
On the Palate
Ingredients
Serves 4How it's made
6 steps · Show ↓30 min active · 1470 min waiting
How it's made
6 steps · Show ↓- 18 min
Yogurt: warm 500ml whole milk + 200ml sweetened condensed milk + 200ml hot water to 43°C. Whisk in 2 tbsp plain live-culture yogurt as starter. Pour into 4 small jars.
Watch outEnsure the temperature does not exceed 43°C to prevent killing the yogurt cultures.
- 2720 min
Incubate jars in a warm spot — 40-43°C oven (light on), warm rice cooker on keep-warm with cloth, or insulated bag with hot-water bottles — for 6-8 hours until set. Refrigerate at least 4 hours.
Watch outCheck that the temperature remains consistent; too cool will slow fermentation.
- 3720 min
Black sticky rice: rinse 200g black glutinous rice (gao nep cam — sticky black/purple rice, distinct from forbidden rice) and soak overnight, 8-12 hours.
- 440 min
Drain. Steam in a cloth-lined steamer over boiling water 35-40 minutes until grains are tender but still chewy. Cool to body temperature on a tray.
Watch outAvoid overcooking the rice; it should remain chewy.
- 51 min
Crumble 1g powdered men ngot (sweet rice-wine yeast — found in Vietnamese groceries) over the rice. Toss gently. Pack into a clean jar, leaving headspace. Cover loosely. Ferment at room temperature 36-48 hours — rice should become juicy with sweet rice-wine liquid pooling at the bottom and smell faintly of wine.
Watch outEnsure the jar is not sealed tightly to allow gases to escape during fermentation.
- 62 min
To serve: spoon yogurt into a tall glass, top with 2-3 tablespoons of fermented black rice plus its liquid, drizzle a thread of condensed milk. Eat with a long spoon — yogurt cool, rice room-temp, layers stay separate.
