How to Make Vietnamese Egg Coffee

Vietnamese egg coffee, known as ca phe trung, replaces dairy milk entirely with a thick, whipped foam made from egg yolks and sweetened condensed milk. The hot, bitter Robusta base is sipped through a cool, silky topping that sits somewhere between cream and custard. The contrast between the two is the defining experience of the drink.

This guide covers how to make egg coffee at home correctly, including the one step most recipes skip: gently heating the egg foam before serving.

What Is Ca Phe Trung?

Ca phe trung means egg coffee in Vietnamese. It is a Hanoi specialty served hot rather than iced, which immediately distinguishes it from Ca Phe Sua Da. Where Ca Phe Sua Da is refreshing and cooling, ca phe trung is warming, rich, and deeply indulgent.

The coffee base and the egg foam are kept as separate elements in the glass and experienced together in every mouthful using a small spoon. Stirring them together before drinking changes the texture significantly and is not how the drink is traditionally consumed.

Where Vietnamese Egg Coffee Came From

Ca phe trung originated at Giang Cafe in Hanoi in the late 1940s. Founder Nguyen Van Giang developed the recipe during a period of milk scarcity by replacing dairy with whipped egg yolks and condensed milk. The thick foam proved stable enough to float on coffee and rich enough to replicate the creaminess that milk would have provided.

The drink became a Hanoi institution and remained largely local for decades before Vietnamese coffee culture brought it to international attention. It now appears on specialty cafe menus globally, though the original Giang Cafe in Hanoi is still considered the benchmark.

What You Need

The Coffee Base

The base for ca phe trung is a concentrated Robusta brew, traditionally made through a phin filter. The phin sits directly over a small ceramic cup, hot water is poured over the grounds, and the coffee drips through slowly over 4 to 6 minutes.

A phin filter is a manual brewer that requires no electricity and produces a full-bodied, low-acid cup that holds its own beneath thick egg foam. Medium-fine grounds and water at 92 to 95 degrees C produce the cleanest base. A consistent coffee grinder ensures even particle size, which directly affects how cleanly the coffee separates from the foam in the finished drink.

The Egg Topping

The egg topping uses three ingredients:

• 2 fresh egg yolks
• 2 to 3 teaspoons of sweetened condensed milk
• A small pinch of salt

Fresh eggs are non-negotiable. The protein structure in fresh yolks produces a stable, thick foam. Older eggs may not whip to the correct consistency, and the foam will collapse quickly once spooned over the coffee.

How to Make Vietnamese Egg Coffee: Step by Step

Step 1: Brew the Coffee Base

Place the phin filter over a small ceramic cup. Add 18 to 20g of medium-fine ground dark Robusta coffee, bloom with 20ml of hot water, then fill the chamber with 80 to 90ml. A Fellow Stagg EKG or any temperature-controlled kettle holds the water at 92 to 95 degrees C throughout, which matters for the phin’s slow drip rate.

Step 2: Prepare the Egg Mixture

While the phin drips, separate two egg yolks into a clean, dry mixing bowl. Add 2 to 3 teaspoons of sweetened condensed milk and a small pinch of salt. Do not add the whites; only the yolks produce the correct texture.

Step 3: Whip the Foam

Whisk the yolk and condensed milk mixture vigorously until the foam turns pale and thick. It should hold a ribbon shape when lifted from the bowl. A hand electric whisk takes 3 to 4 minutes. A manual whisk takes 6 to 8 minutes of sustained effort.

Step 4: Use the Bain-Marie

Fill a bowl with hot water at around 60 to 70 degrees C. Place the mixing bowl inside and whisk gently for 1 to 2 more minutes. This step removes any raw egg character and thickens the foam further without cooking it. Skipping this step is the most common reason egg coffee tastes flat at home.

Step 5: Assemble the Drink

Spoon the whipped egg foam over the brewed coffee in the cup. Aim for a roughly 1:1 ratio of coffee to foam by volume. Do not stir.

Step 6: Serve

Place the cup inside a small bowl of hot water to keep the drink warm throughout. Serve with a small spoon. Each mouthful should carry both the coffee from below and the foam from above.

Getting the Egg Foam Right

The egg foam is what defines ca phe trung, and it is where most home attempts fall short.

Common Mistakes

• Under-whipping: the foam is still liquid and sinks into the coffee immediately
• Skipping the bain-marie: the foam tastes eggy and raw rather than custard-like
• Using old eggs: the foam collapses within a minute of being spooned
• Overheating in the water bath: the yolks begin to scramble and the foam turns grainy

Target Consistency

The correctly whipped foam should be pale cream in colour, thick enough to hold a ribbon shape, and stable enough to sit on the coffee surface for at least 5 minutes before thinning. A set of barista tools including a hand whisk, a digital thermometer, and small ceramic cups makes the result more consistent across repeated attempts.

How to Serve Ca Phe Trung Correctly

Traditional serving at Giang Cafe places the cup inside a small ceramic bowl of warm water. This acts as an insulating jacket and keeps the drink at temperature for long enough to eat through slowly.

The drink is meant to be consumed over 5 to 10 minutes, not quickly. Use a small spoon to scoop the egg foam and coffee together in each mouthful rather than mixing them in advance. The interplay between the hot coffee and the cool, dense foam is what makes the experience distinctive.

Variations Worth Trying

Iced Ca Phe Trung

Brew a double-strength phin base and let it cool to room temperature. Pour over ice in a glass and spoon the egg foam over the top as normal. The cold base changes the character of the drink considerably, making it lighter and more refreshing, but the foam preparation remains identical.

Espresso-Based Egg Coffee

A double ristretto or double espresso replaces the phin base for a more concentrated, intense result. A reliable espresso machine with stable extraction pressure ensures the shot is strong enough to hold its character beneath the egg foam without either element overwhelming the other.

Cocoa Egg Coffee

Add half a teaspoon of unsweetened cocoa powder to the yolk and condensed milk mixture before whipping. The cocoa incorporates into the foam during whipping and produces a mild chocolate note that works well with a dark Robusta base.