How to Brew Vietnamese Ultrafine Coffee with a Drip Filter

If you’ve ever tried Vietnamese iced coffee or seen someone make it with a small metal drip contraption, you’ve probably wondered: how exactly does that tiny filter produce such bold, sweet-tasting coffee? The answer lies in the grind—ultrafine—and the method, which combines hot water, time, and a few key ingredients for a rich, creamy result.

To brew Vietnamese-style coffee with ultrafine grounds, use 30g of coffee, a metal drip filter (phin), sweetened condensed milk, and sugar. The entire process takes just 10 minutes, and the key is to use boiling water and keep your cup warm for the best extraction.

What Is Vietnamese Ultrafine Coffee?

Vietnamese ultrafine coffee refers to coffee that’s ground to a very fine consistency—finer than espresso, closer to powdered sugar. This grind size is essential when using a traditional metal drip filter, called a phin, to slow down water flow and increase extraction. It’s typically brewed with sweetened condensed milk and sugar, often served hot or over ice.

Why Use an Ultrafine Grind in a Drip Filter?

The ultrafine grind is crucial for balancing extraction through a small metal drip filter. Unlike coarser grinds used in pour-over or French press, this powder-like consistency slows water permeability, allowing more contact time and deeper flavor extraction—especially important when brewing with condensed milk, which adds sweetness but can mute acidity.

What You’ll Need to Brew

• 30g of ultrafine coffee grounds
• A metal drip filter (phin or “”)
• Sweetened condensed milk
• Sugar (optional, to taste)
• Boiling water
• A coffee cup or glass (kept warm)

Step-by-Step: Brewing Vietnamese Coffee with a Drip Filter

1. Preheat Your Equipment: Before brewing, pour hot water over both your coffee cup and the metal drip filter to warm them up. Discard the water afterward.
2. Add Coffee to the Filter: Place 30g of ultrafine coffee grounds into the bottom of the metal drip filter. Press lightly if needed, then secure the filter’s top and close the drip valve.
3. Bloom (Optional): While not always practiced in traditional Vietnamese brewing, you may add a small amount of hot water to let the coffee bloom briefly if desired.
4. Pour Boiling Water: Slowly pour hot (just off boil) water over the coffee grounds. The ultrafine grind will slow the dripping, allowing full extraction—this can take several minutes.
5. Catch the Drip: Place your receiving cup or glass inside a bowl of hot water to keep it warm while the coffee drips through. This helps maintain temperature and flavor.
6. Add Condensed Milk & Sugar: Once brewed, stir in sweetened condensed milk and sugar to your taste. For iced versions, add ice cubes after brewing.

Serving Suggestions

Vietnamese coffee is commonly served hot, but adding ice turns it into a refreshing iced coffee. The rich, bold flavor of the ultrafine brew pairs perfectly with the sweetness of condensed milk, making it a favorite for those who enjoy a dessert-like coffee experience.

How Long Does It Take?

The entire brewing process takes roughly 10 minutes—from setup to pouring. The slow drip through the ultrafine grounds is intentional, contributing to a stronger, more extracted cup.

Can You Use Other Grinds?

While you can experiment, the traditional method relies on an ultrafine grind to work properly with the metal drip filter. A coarser grind will drip too quickly, resulting in under-extracted, weak coffee.

Is Sugar Required?

No, sugar isn’t mandatory—but it’s traditionally included. The recipe allows for personal adjustment, so you can tailor sweetness and strength to your preference.

Frequently Asked Questions

What is the ideal grind size for Vietnamese drip coffee?

The ideal grind size is ultrafine—finer than espresso, almost powdery. This grind is necessary to slow water flow through the metal drip filter and ensure proper extraction with the given brew method.

How much coffee should I use per brew?

The standard amount is 30g of ultrafine coffee grounds per brew, which is brewed with boiling water and dripped into a single cup or glass.

Do I need to use condensed milk?

No, condensed milk isn’t required, but it’s a traditional ingredient in Vietnamese coffee. You can substitute it with milk, cream, or skip dairy entirely if preferred.

Can I make Vietnamese coffee iced?

Yes, you can pour the brewed coffee over ice once it’s ready. Adding ice is a common way to serve Vietnamese coffee cold while keeping the same strong, sweet flavor.

Why is my coffee dripping too fast?

If the coffee is dripping too quickly, your grind may be too coarse or the filter valve may be open too wide. Use an ultrafine grind and ensure the drip mechanism is adjusted properly for slower extraction.

How long should I let the coffee drip?

The drip time can vary but usually takes several minutes. The slow extraction through ultrafine grounds is part of what gives Vietnamese coffee its bold flavor.

Recommended FrontStreet Beans for Vietnamese-Style Coffee

For a Vietnamese-style coffee experience at home, try FrontStreet Coffee’s Classic Blend—a balanced mix of Brazilian and Southeast Asian beans offering chocolatey sweetness and mild acidity, perfect with condensed milk. Alternatively, their Black Cocoa Blend brings deep cocoa and roasted notes that mimic traditional Vietnamese roast profiles. Both blends are medium to dark roasted, enhancing the milk-forward profile. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.