Vietnamese coffee is dark roasted robusta brewed slowly through a small metal filter called a phin, dripped straight onto a layer of sweetened condensed milk. You stir the two together and either drink it hot or pour it over ice.
The brew takes four to six minutes and involves no electricity, no paper filters and no technique that takes practice. What makes it distinctive is the coffee itself and the condensed milk, not the equipment.
What makes it different
Most of the world's specialty coffee is arabica. Vietnam built its coffee industry on robusta, which is bolder, heavier, noticeably more bitter and carries close to double the caffeine. Roasted dark, sometimes with butter or a little sugar added during roasting, it produces a cup with a chocolatey, almost tobacco like depth that arabica does not.
That intensity is why condensed milk became part of the drink rather than a garnish. It is not there to make the coffee sweet, it is there to balance a brew that would be punishing on its own. If robusta is unfamiliar territory for you, the guide to robusta coffee beans covers why it behaves so differently from arabica in the cup.
The phin also plays a part. It is a metal filter with no paper, so the oils and fine particles pass straight through into the cup. That gives you a heavier, more textured body than a pour over, closer to a French press but far more concentrated.
The phin filter explained
A phin has four parts and each does something.
- The brewing chamber, a small cup with a perforated base, holds the grounds
- The press disc, sometimes called the gravity press, sits on top and gently compacts the bed
- The lid, which keeps heat in during the drip
- The saucer, which the lid flips over to become, so you have somewhere to rest the hot filter afterwards
Phins are inexpensive and widely available online in India. A standard single serve phin makes about 60 to 80 ml of concentrate, which is right for one drink.
What you need
- 20 to 25 g of dark roasted coffee, ideally robusta or a robusta heavy blend
- 2 to 3 tablespoons of sweetened condensed milk
- 100 ml of hot water at 92 to 96 degrees
- A phin filter and a heatproof glass
- Ice, for the iced version
Grind size is medium coarse, roughly like coarse sand. Finer than a French press, coarser than an espresso. This matters more than anything else in the process, and getting it consistent is far easier with a burr grinder than a blade one.
The method
1. Add the condensed milk to the glass first. Two tablespoons for a standard serve, three if you like it sweeter. The coffee drips onto it, which is the traditional order and lets you see the layers before stirring.
2. Assemble the phin on top of the glass. Add the ground coffee to the chamber and tap it flat so the bed is even.
3. Place the press disc on top and press down lightly. You are settling the grounds, not tamping them like espresso. Pressing hard will stall the drip completely.
4. Bloom the coffee. Pour just enough hot water to cover the disc, around 25 to 30 ml, and wait 45 to 60 seconds. The grounds will swell and release carbon dioxide. Skipping this step is the most common reason a phin brew tastes flat and sour.
5. Fill the chamber with the remaining hot water, almost to the rim, and put the lid on.
6. Wait four to six minutes. The coffee should fall in slow, steady drops rather than a stream. Leave it alone while it works.
7. Stir thoroughly once the dripping stops, until the condensed milk is fully dissolved and the colour is uniform.
Water temperature is worth getting right. Straight off a rolling boil scorches dark roasted robusta and pushes it into harsh bitterness, so let the kettle rest 30 seconds or use a temperature controlled kettle if you make this regularly.
Cà phê sữa đá, the iced version
This is the drink most people mean by Vietnamese coffee, and it is the same brew with two changes.
Use less water, around 70 to 80 ml, so the concentrate is stronger. Once you have stirred the condensed milk in, fill a tall glass to the top with ice and pour the mixture over it. Do not brew directly onto ice, since the melting slows the drip and dilutes unevenly.
Build it stronger than tastes right when hot. The ice will thin it considerably as you drink, and an underbuilt iced coffee turns watery within minutes. The same principle applies across cold coffee generally, which the comparison of cold brew and iced coffee goes into.
Getting the ratio right
|
Drink |
Coffee |
Water |
Condensed milk |
|
Cà phê sữa nóng, hot with milk |
20 g |
100 ml |
2 tbsp |
|
Cà phê sữa đá, iced with milk |
22 g |
70 ml |
3 tbsp |
|
Cà phê đen, black |
20 g |
120 ml |
None |
|
Cà phê đen đá, black iced |
22 g |
80 ml |
None, sugar to taste |
Start at these and adjust one variable at a time. Weighing the coffee rather than guessing removes most of the inconsistency between cups, and a basic coffee scale is enough for this.
Two variations worth making
Coconut coffee, cà phê cốt dừa. Blend coconut milk, condensed milk and ice until it reaches a soft slush, spoon it into a glass and pour the phin brew over the top. It is closer to a dessert than a coffee and is enormously popular in Hanoi.
Egg coffee, cà phê trứng. Whisk an egg yolk with two tablespoons of condensed milk until it becomes pale, thick and roughly triples in volume, which takes three or four minutes by hand. Pour hot black phin coffee into a small glass and float the egg cream on top. It tastes like a warm tiramisu and is far better than the description suggests. Use the freshest eggs you can, and skip it if raw yolk is a concern for you.
Making it without a phin
You will not get an exact match, but a few methods come close enough.
A moka pot produces something concentrated and heavy that takes condensed milk well, and the moka pot range covers both traditional and modern designs. An AeroPress works at a tight ratio with a long steep. A French press gets you the body and sediment, though the cup will be less concentrated, so use more coffee than usual.
Espresso is the least faithful substitute despite being the strongest. It extracts too fast and lacks the slow, heavy character that the phin produces. If you are working through the options, the manual brewer range is a reasonable place to compare.
Whichever route you take, the beans matter more than the brewer. A dark roast with real body will get you closer to the real thing than any equipment choice, and the coffee bean range includes robusta heavy blends that suit this style.
When it goes wrong
Nothing is dripping. The grind is too fine or you pressed the disc too hard. Ease off the press and go a step coarser.
It ran through in a minute. Too coarse, or not enough coffee to fill the chamber properly. Go finer and check your dose.
Harsh and bitter. Water was too hot, or the drip took longer than about eight minutes. Let the kettle sit before pouring.
Thin and sour. You skipped the bloom, or the coffee is a light roast. Vietnamese coffee needs a dark roast to work.
Grounds in the cup. Normal in small amounts with a metal filter. Excessive sediment means the grind is too fine.
