Vietnamese Coffee (hanoi) Recipe

Prepare gelatin (optional)

If using gelatin for stability, sprinkle 1 tsp gelatin over 15 ml cold water in a small bowl and let bloom for 5 minutes.

Heat milk and cream

In a saucepan, combine 120 ml whole milk and 120 ml heavy cream. Warm over medium heat until steaming but not boiling (about 75–80°C / 170–175°F). Remove from heat.

Temper egg yolks

Whisk 3 egg yolks with 30 g granulated sugar and 10 g unsweetened cocoa powder in a heatproof bowl until slightly thickened and pale. Slowly pour about one-third of the hot milk-cream mixture into the yolks, whisking constantly to temper. Then pour the tempered yolks back into the saucepan with the remaining milk-cream, stirring continuously.

Cook custard

Return the saucepan to low heat and stir constantly with a spatula or whisk until the mixture thickens enough to coat the back of a spoon (temperature around 82–85°C / 180–185°F). Do not boil to avoid curdling.

Add chocolate and butter

Remove the pot from heat. Immediately add 150 g finely chopped dark chocolate and 60 g butter. Stir gently until the chocolate and butter are fully melted and the mixture is smooth.

Incorporate gelatin (if used)

If using gelatin, warm the bloomed gelatin briefly (10–15 seconds) in the microwave or over a double boiler until melted, then whisk into the chocolate custard until fully incorporated.

Chill custard

Transfer the chocolate custard to a shallow bowl, cover surface with plastic wrap to prevent a skin, and chill in the refrigerator until cool, about 1 hour.

Whip mousseline

Once the chocolate custard is cold but still pourable, whip it with an electric mixer on medium-high speed for 2–3 minutes to lighten and create a mousseline texture. You should have a light, airy chocolate cream that holds soft peaks. Return to refrigerator if necessary to firm slightly before assembling.

Brew Vietnamese-style coffee

Place 30 g coarsely ground dark roast coffee into a phin filter or into a small French press. Pour 180 ml boiling water over the grounds and allow to steep for 3–5 minutes, pressing gently if using a French press. If using a phin, allow drip-through to finish. The result should be a strong concentrate.

Sweeten

Stir 40 g sweetened condensed milk into the hot coffee concentrate until fully dissolved. Taste and adjust sweetness if desired. Let the coffee cool slightly (5–10 minutes) before layering.

Combine milks

In a small pitcher, whisk together 80 ml whole milk, 40 ml buttermilk and 15 g sweetened condensed milk until homogenous. Taste and adjust the condiment to achieve a slightly tangy, lightly sweet milky layer. Chill for 5–10 minutes if needed so the layer is cool for assembly.

Prepare serving glasses

Select 2 to 3 serving glasses (about 200–250 ml capacity). If serving iced, add 3 ice cubes per glass.

Layer leche & buttermilk

Pour approximately 60 ml of the leche & buttermilk mixture into each glass to form the bottom layer (adjust to fit your glass and desired proportions).

Add coffee concentrate

Slowly spoon or carefully pour about 45–60 ml of the sweetened coffee concentrate over the back of a spoon onto the milky layer to create a defined middle coffee layer. If you prefer a stirred drink, simply pour and mix.

Top with cocoa mousseline

Pipe or spoon about 40–50 g (roughly 2–3 tablespoons) of the chilled cocoa mousseline on top of the coffee layer, creating a thick creamy cap reminiscent of the classic Hanoi presentation with a rich chocolate twist.

Garnish and serve

Sprinkle a small pinch (about 5 g) of cocoa nibs or finely grated dark chocolate over the mousseline and add a mint leaf if desired. Serve immediately. If serving iced, provide a spoon and straw so the drink can be stirred before drinking.

Storage

If not serving immediately, keep the cocoa mousseline refrigerated (up to 24 hours). Prepare coffee and leche-buttermilk fresh before assembly for best texture. Assembled drinks are best consumed within 1 hour.