How to Brew Vietnamese Coffee with a Phin Filter

A Vietnamese phin is wonderfully simple: a metal chamber, a perforated plate, a press and a lid. That simplicity can be misleading. The phin does not demand expensive equipment, but small changes in grind, coffee dose, water temperature and pressure can turn the same beans into a rich cup or a frustrating five-minute trickle.

There is no single sacred recipe. Phin sizes differ, coffee roasts differ and Vietnamese households make coffee to different strengths. What matters more is understanding what each variable is doing.

What a phin actually does

The phin is a gravity brewer. Hot water moves slowly through a compact bed of coffee and drips directly into the cup below. There is no paper filter, so the resulting coffee can have more body and oils than a typical paper-filter brew. It is also usually made in a relatively small volume, which helps explain the concentrated taste.

Start with the right grind

Aim roughly for a medium to medium-coarse grind rather than espresso-fine coffee. Too fine and the water may barely pass through. Too coarse and the cup can run quickly and taste thin. The exact setting depends on your phin and the coffee, so treat the first brew as a calibration rather than a test you can fail.

How much coffee should you use?

For a common small phin, many brewers use roughly 18–25 grams of coffee, but phins vary enough that volume and taste are more useful than pretending one number fits every filter. Fill the chamber with enough coffee to create a level bed while still leaving room for water above the press.

Do not crush the coffee with the press

One of the easiest mistakes is treating the phin like espresso and tamping hard. Most gravity phins do not need that. Set the press gently over the grounds. Too much pressure can choke the flow and make the brew painfully slow or uneven.

Bloom first

Add a small amount of hot water and give the coffee around 20–30 seconds to absorb it before filling the chamber. This helps wet the grounds more evenly and releases trapped gas, especially with fresher coffee.

Water temperature matters, but boiling is not the goal

Water just off the boil is a practical starting point. Extremely hot water can push a dark roast toward harsher bitterness, while water that is too cool can leave the cup flat. If you have a kettle with temperature control, somewhere around the low-to-mid 90s Celsius is a reasonable range to experiment with rather than a rigid rule.

Watch the drip, not only the clock

A small phin often takes around four to six minutes, but flow tells you more than a stopwatch. The first drops should appear after a short pause, followed by a steady drip rather than a stream. If the water races through, grind finer or use a little more coffee. If almost nothing moves, grind coarser or lighten the press.

Condensed milk goes in before or after — both work

A classic method puts condensed milk in the glass first and lets the coffee drip directly onto it. This makes the layers visible and gives you something satisfying to stir at the end. You can also brew black first and add sweetness afterwards if you want more control over the ratio.

Why your phin coffee tastes too bitter

Possible causes include a very dark roast, too fine a grind, excessive contact time or water that is hotter than the coffee needs. But remember that traditional Vietnamese coffee is often intentionally bold. Before deciding the brew failed, taste it in the style it was designed for — perhaps with condensed milk or over ice.

Why your phin coffee tastes weak

The usual reasons are a coarse grind, too little coffee, too much water or a brew that drains too fast. Changing one variable at a time is much more useful than changing everything together.

The Best Reason to Learn How to Brew Vietnamese Coffee with a Phin Filter

A phin teaches you something machines hide: coffee extraction is visible. You can watch the speed change, smell the bloom and adjust the next cup with almost no equipment. Once you understand that, Vietnamese coffee stops feeling like a mysterious recipe and starts feeling like a very simple craft.

Continue exploring: Vietnamese coffee culture · Vietnamese coffee drinks guide · Coffee Workshop

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Dung (Emma) Co-founder of Beyond Vietnam

Xin chào! I’m Dung, but many travellers call me Emma. I grew up on the outskirts of Hanoi, and no matter how far I travel, this busy and slightly chaotic city still feels most like home.

I’ve explored Vietnam on my own and with the people I love, while also spending years volunteering and joining community projects. Along the way, I’ve collected plenty of stories, local tips and unforgettable moments. I share them here to help you feel closer to Hanoi and Vietnam, hopefully even before you arrive.

You can also find me on Facebook. Come and say hi!