Vietnamese Egg Coffee (Cà Phê Trứng): The “Addictively Fluffy” Custard Coffee

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Why It’s Special

Cà Phê Trứng is more than a caffeine fix; it’s a liquid dessert. Imagine a dark, bitter espresso topped with a thick, airy custard that tastes exactly like a toasted marshmallow or a fine tiramisu. As the crown jewel of Hanoi’s cafe culture, this Vietnamese egg coffee is a must-try for anyone who thinks they’ve seen everything the coffee world has to offer.

My Recent “Custard Discovery”

Growing up in Saigon, I spent my childhood surrounded by the smell of roasting beans, but surprisingly, I didn’t grow up drinking this. It wasn’t until my recent trips back to Vietnam, specifically visiting the legendary cafes in the Old Quarter of Hanoi, that I realized what I had been missing. Bringing this Vietnamese egg coffee recipe back to my kitchen felt like the perfect way to bridge my childhood memories with the modern, vibrant coffee scene in Vietnam today.

What is Cà Phê Trứng?

Originating in the 1940s when milk was scarce, resourceful baristas in Hanoi began using whisked egg yolks as a decadent substitute for dairy. The result is a specialty drink consisting of a strong Vietnamese coffee base topped with a meringue-like foam made of egg yolks and sweetened condensed milk.

For a long time, I never made the connection between this famous coffee and my own childhood. When we first moved to Canada, we didn’t have much money to go out for fancy desserts, so I remember my mom whipping up egg yolks into a thick, sweet custard for me to eat as a special treat. It wasn’t until I saw a barista in Hanoi doing the exact same thing that I realized my mom had been giving me a “deconstructed” version of this cultural icon all along. It’s amazing how a simple act of motherly resourcefulness can mirror a national tradition.

Key Things to Know Before You Start

• The “Shatteringly Fluffy” Texture: Unlike a latte foam, this custard should be thick enough to hold a spoon. It’s all about the air you incorporate during the whisking process.
• Freshness Matters: Use the freshest, pasteurized eggs possible. Since we are only lightly heating the foam via the hot coffee, quality is key.
• The “Warm Bath”: To keep your Hanoi egg coffee hot while you sip, traditional cafes serve the glass sitting in a small bowl of hot water.

5. Ingredients and Substitutions

• The Coffee: 3 tbsp Cafe du Monde (for that nostalgic chicory bite) or Nguyen Coffee Supply 100% Robusta for a stronger kick.

• The “Custard”: 2 large egg yolks (room-temperature), 1 tbsp granulated sugar and 1 tbsp sweetened condensed milk.
• Optional: A drop of vanilla extract to mellow out any “eggy” scent.
• Substitution: If you don’t have a Phin filter, you can use a very strong shot of espresso, but you’ll lose that signature syrupy body.

6. How to Make Cà Phê Trứng Step-by-Step

• Set the Phin: Place the Phin plate and chamber over the glass. Add 3 tbsp of coffee grounds and level them gently. Place the gravity press on top.

• The Under-Bloom (Nancy’s Secret Step): Pour about 1 tablespoon of hot water into the overturned Phin lid and set it on the counter. Place the entire Phin assembly directly onto the lid so the bottom of the filter is submerged in that small pool of water.
• The Top-Bloom: Now, pour just enough hot water (about 2 tbsp) into the top of the chamber to wet the grounds from above. Wait 2–3 minutes. This allows the coffee to expand and prevents it from brewing too quickly.
• The Main Pour: Fill the Phin chamber to the top with hot water and cover with the lid.
• The Wait: Let it drip completely (usually takes about 5-7 minutes).
• Whisk: While the coffee drips, combine the egg yolks and granulated sugar in a small bowl or a shatterproof glass.

• Froth: Use an electric handheld frother (or an electric whisk) for about 5-7 minutes until the mixture triples in size and turns a pale, creamy yellow. Add in the condensed milk and whisk to incorporate.

• Assemble: Pour the hot coffee into a small glass. Gently spoon the thick egg custard on top. It should float perfectly on the surface.
• The Finish: Dust with a little cocoa powder or cinnamon.

Storage, Reheating and Make Ahead Tips

• Make Ahead: You can make the coffee ahead of time but do not whisk the egg foam in advance, but it may lose some air. 
• Storage: This drink is meant to be enjoyed immediately. The foam will collapse if stored in the fridge.
• Reheating: Do not microwave! The eggs will scramble. If it gets cold, sit the glass in a bowl of very hot water to gently warm it through.

How to Serve Cà Phê Trứng

Serve in a clear glass so you can see the beautiful contrast between the black coffee and the golden foam. Always provide a small spoon—the tradition is to eat a few spoonfuls of the “meringue” first before stirring the rest into the coffee.

Additional Tips for Success and Mistakes to Avoid

• Mistake: Skipping the Bloom: If the coffee isn’t strong and hot, it won’t cut through the richness of the egg. Give it those 3 minutes to bloom!
• Success Tip: If your foam is too “liquidy,” you haven’t whisked long enough. It should have the consistency of soft-serve ice cream.
• Success Tip: Make sure your bowl and frother are completely dry before starting; any water can affect the foam’s stability.

FAQs

• Does it taste like eggs? Surprisingly, no! When whisked with condensed milk, it tastes like a rich, vanilla custard.
• Is it safe to eat? The heat from the freshly brewed coffee “cooks” the thin layer of foam it touches. However, always use pasteurized eggs if you are concerned.
• Can I use egg whites? No, the whites will make the foam too stiff and “rubbery.” Stick to the yolks for that silky mouthfeel.
• Can I add the sugar and condensed milk to the egg yolks at the same time?  You can, but it will make your custard less airy. Sugar traps air better than condensed milk, which is heavy and weighs the egg yolks down. Take the time to do this separately to get perfect results.

Pro-Tip: If you love the decadent, custard-like top of this Vietnamese egg coffee, you have to try its salty cousin! Check out my guide on How to Make Vietnamese Salt Coffee (Cà Phê Muối) for another viral modern classic.