Vietnamese Egg Coffee
Cà phê trứngka fey chung
Egg yolk whipped with condensed milk into a warm custard foam, floated on strong phin-brewed robusta. It drinks like tiramisu. The recipe exists because Hanoi ran out of milk in 1946.
At a glance
- Coffee : water
- 1:4
- Active time
- 10 min
- Total time
- 15 min
- Makes
- 1 glass
- Serve
- Hot, in a water bath
- Kit
- Phin + hand mixer
Ingredients
Note: Use pasteurised eggs if you are pregnant, elderly, very young or immunocompromised. They whip just as well.
Method
-
Warm the glass
Pour boiling water into your serving glass, swirl it, tip it out. Then stand the glass in a shallow bowl of hot water and leave it there.
Hanoi cafes serve the drink in that bath and it is not for show. The foam firms up as it cools and the coffee underneath turns sludgy.
-
Load the phin and bloom
Sit the phin on the glass, add the grounds, shake it level. Rest the gravity insert on top without pressing. Pour in about 20 ml of water and wait while the bed swells.
Skipping the bloom is the usual reason a phin runs fast and sour. Dry grounds channel.
Bloom 30 seconds -
Brew it slowly
Add the rest of the water, cap the phin, and leave it alone. You want a drip you can count, finishing in four to five minutes.
A minute means the grind is too coarse or the insert is sitting loose. A full stall means too fine.
Drip 4 to 5 minutes -
Whip the yolk
Put the yolk and condensed milk in a small deep bowl and beat on medium. It goes from orange liquid to pale, thick and roughly three times the volume. Add the vanilla near the end if you are using it.
Stop when a lifted beater leaves a ribbon that holds for two seconds. Keep going past that and it turns grainy.
Whip 3 to 5 minutes -
Float and serve
Lift the phin away. Spoon the foam over the coffee in one go rather than dribbling it, so it sits as a layer instead of sinking. Serve it in the water bath with a long spoon.
Drink it through the foam for the first half, then stir the rest together. Those are two different drinks and both are worth having.
Why this works
Egg yolk is about a third fat and carries a lot of lecithin, which is one of the better emulsifiers in a home kitchen. Beating it drives in air, and the lecithin wraps each bubble so it stays put. That is the same mechanism behind hollandaise and zabaglione, and it is why the foam holds for ten minutes rather than ten seconds.
Condensed milk does two jobs. It sweetens, and its dissolved sugar thickens the mixture enough to stop the bubbles collapsing into each other. Swap in fresh milk and you get a thin yellow liquid, no matter how long you beat it.
Robusta matters more than people expect. It carries roughly double the caffeine of arabica, with a heavier body and a flat, cocoa-like bitterness. In a pour-over that profile would be a fault. Under a sweet custard it is the only thing stopping the drink tasting like warm dessert. Arabica disappears underneath the yolk.
One historical note, because it explains the proportions. Nguyen Van Giang was a bartender at the Metropole hotel in Hanoi in 1946, during a milk shortage. He reached for egg yolk as a substitute and kept the condensed milk that Vietnamese coffee already used. The drink was an improvisation that stuck, and his family still runs Giang Cafe in the old quarter.
Variations
- Cà phê trứng đá: the iced version. Brew over ice, whip the yolk stiffer, serve in a tall glass.
- Cacao trứng: swap the coffee for hot chocolate. This is what Hanoi cafes give children.
- With butter: a half teaspoon of soft butter beaten into the yolk. Richer, and it holds even longer.
- Salted: a pinch of fine salt in the foam. Cuts the sweetness and makes the coffee read as stronger.
On raw egg: the yolk is barely warmed by the coffee, so treat this like homemade mayonnaise or mousse. Use pasteurised eggs if you are pregnant, elderly, very young or immunocompromised.
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Questions
Does it taste of egg?
Not if you whip it properly. Under-whipped yolk tastes eggy because the sulphur compounds have not been diluted through enough air and sugar. Whip to the ribbon stage and it reads as custard or tiramisu cream. The vanilla helps if you are nervous.
Can I make it without a phin filter?
Yes. Brew 100 ml of very strong coffee in a moka pot or an AeroPress and use that. You lose the slow drip but the drink still works. Drip coffee from a machine is too weak unless you double the dose.
Why did my foam sink straight into the coffee?
Three usual causes. The yolk was cold, the mixture was under-whipped, or you dribbled it on slowly instead of spooning it over in one movement. Cold yolks are the most common of the three.
How much caffeine is in it?
Around 150 to 200 mg, because robusta carries about twice what arabica does. That is more than a double espresso. It is a morning drink in Hanoi for a reason.
Can I use the whole egg?
No. The white whips into a meringue that sits separately and tastes of nothing. Save it for something else. Only the yolk has the fat and lecithin this needs.