The phin

A filter, not a machine

The phin is a four-piece brewer. A perforated plate sits on the cup, a small chamber holds the grounds, a press disc rests on top of them, and a lid keeps the heat in. Pour hot water over, then wait. There is no pump and no pressure. Gravity does the work, and it does it slowly.

That slowness is the point. The coffee drips a bead at a time, so the cup arrives dense and syrupy rather than thin. In Vietnam the phin sits on the table in front of you while you talk. The drink is finished when it is finished.

Why robusta

The usual story is that French colonists brought coffee to Vietnam in 1857, first as arabica in the north, with robusta following in the early twentieth century. Robusta found its home on the red basalt plateaux of the Central Highlands, around Buôn Ma Thuột in Đắk Lắk, which today grows around a third of the national crop.

Vietnam is now the second-largest coffee producer on earth and the largest producer of robusta by a distance, accounting for roughly two-fifths of the world's supply. Nearly all of what it grows is robusta. The bean is hardier than arabica, carries about twice the caffeine, and tastes darker: cocoa, toast, a bitter edge. It is not a lesser bean. It is a different one, and the phin was built for it.

The condensed milk question

Fresh milk was scarce and spoiled fast in the colonial-era tropics. Tinned sweetened condensed milk kept, so it became the default. Its sweetness and thickness happen to sit perfectly against a strong, bitter robusta, which is why the pairing survived long after fridges arrived. Cà phê sữa đá is that pairing on ice, and it is the drink most people mean when they say Vietnamese coffee.

How we brew it

We use a medium-fine grind, water just off the boil, and a short bloom before the main pour. A good phin drips at roughly a drop a second and finishes in four to five minutes. Too fast and the cup is weak; too slow and it turns harsh. If you are brewing at home, the numbers in the margin are a reliable start.

Three ways to drink it

Cà phê đen is black, hot or over ice, for people who want the bean and nothing else. Cà phê sữa đá adds condensed milk and ice: sweet, strong, the classic. Bạc xỉu is the gentle one. The name comes from Cantonese, by way of the Chinese quarter of old Sài Gòn, and means roughly a white cup with a little coffee. Mostly milk, a small pour of phin coffee, and a much easier first step in.