How to Prepare Your CoffeeIndonesian Kopi Susu
What you need
Ingredients run from the top of the cup to the bottom; the last item is the bottom layer. Values are normalized to a true 100% stack.
- Grind
- Fine — like sand
- Water temperature
- Water 90–95°C, just off the boil
- Total time
- 6 min
Kopi susu is tubruk with sweetened condensed milk stirred in: finely ground robusta steeped straight in the glass with water just off the boil, then softened with a couple of spoonfuls of susu kental manis. It grew up in Indonesia's traditional coffee stalls, where the condensed milk balanced robusta's strong bitterness, and it is still the kopi susu of the warung — distinct from the iced es kopi susu of today's cafés, which usually swaps in fresh milk and palm sugar. The grounds stay in the glass, so the drink is sipped slowly once they have settled.
Steps
Put the ground coffee in the glass
Tubruk is brewed in the glass it is served in — there is no pot and no filter, so the grounds go straight in.
Wet the grounds with a little hot water and wait 30–45 seconds
A small first pour lets the fine grounds soak and release their gas before the rest of the water arrives, so they mix in instead of floating as a dry crust.
Pour in the rest of the water, stir, and leave it about 2 minutes
The grounds steep in the glass and then start sinking; this rest is the whole brew time.
Stir in the condensed milk and let it rest another 2–3 minutes
The milk dissolves into the hot coffee as you stir; the second rest lets the grounds settle again so you can sip from the top and leave the sediment behind.
Cup ready
Time to enjoy your Indonesian Kopi Susu
Brewed the way they do it in Indonesia. What next?
Tips
- Don't drink the last mouthful — in any tubruk the grounds stay at the bottom of the glass.
- UHT milk is a lighter alternative to condensed milk; add sugar to taste if you use it, since it brings none of its own.
- The iced es kopi susu sold in Indonesian cafés today is a newer drink — usually espresso or filter coffee with fresh milk and palm sugar (gula aren) — not this tubruk-and-condensed-milk glass.
Common mistakes
- Boiling the grounds in a pan — tubruk is steeped in the glass with water just off the boil, not cooked on the stove.
- Drinking it straight away — until the grounds have settled, every sip carries sediment.
- Too much condensed milk — past about three spoonfuls the glass tips into syrup and the robusta disappears under the sweetness.
Variations
Within the Indonesian Coffee tradition, the preparation above takes these familiar shapes:
Vietnamese Phin Coffee
The family resemblance is real — robusta and sweetened condensed milk — but kopi susu is tubruk-style, steeped with the grounds left right in the glass, while Vietnam's phin drips clean through a metal filter for a more concentrated cup.
Indonesian Kopi Tubruk
The black brew kopi susu starts from: the same strong coffee made tubruk-style with the grounds left in the glass, drunk without the condensed milk.
FAQ
How is kopi susu different from Vietnamese cà phê sữa?
The family resemblance is real — robusta and sweetened condensed milk — but the brew differs. Kopi susu is tubruk-style: hot water poured over the grounds in the glass, with the grounds left to settle at the bottom. Vietnamese coffee drips through a phin filter, so it arrives clean and more concentrated.
The Atlas
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