What Is Kopi Susu?

Kopi susu — literally "coffee milk" in Indonesian — is one of the most popular coffee drinks across the Indonesian archipelago. In its most traditional form, it's simply strong brewed coffee (often Robusta) combined with sweetened condensed milk. The result is a rich, sweet, intensely satisfying drink that has fueled generations of Indonesians through warm mornings and long afternoons.

In recent years, es kopi susu (iced kopi susu) has exploded in popularity, driven by the growth of modern kopi chains like Kopi Kenangan, Janji Jiwa, and Es Kopi Tak Ternilai across Indonesian cities. But the heart of the drink is simple, and making it at home is easy once you know the basics.

The Classic Iced Kopi Susu Recipe

Ingredients (1 serving)

  • 2–3 tablespoons (25–35g) finely ground dark-roasted Robusta or Arabica coffee
  • 150ml hot water (just off the boil)
  • 2–3 tablespoons sweetened condensed milk (adjust to taste)
  • A large handful of ice cubes

Method

  1. Brew your coffee strong. Use a moka pot, AeroPress, or make a concentrated kopi tubruk by steeping 30–35g of fine-ground coffee in 150ml of boiling water for 4 minutes, then carefully pouring off the liquid without disturbing the grounds.
  2. Add condensed milk. Pour 2–3 tablespoons of sweetened condensed milk into the bottom of your serving glass. Adjust the amount to your sweetness preference — traditional versions are quite sweet.
  3. Fill the glass with ice. Pack the glass generously with ice cubes.
  4. Pour hot coffee over the ice. Pour your brewed coffee slowly over the ice. The contrast of hot coffee hitting cold ice creates the slightly diluted, perfectly chilled consistency that makes es kopi susu so refreshing.
  5. Stir gently and serve immediately. Give a quick stir to incorporate the condensed milk. Drink right away before the ice melts further.

Tips for the Best Kopi Susu

  • Use strong coffee. The ice will dilute the brew, so start more concentrated than you think you need.
  • Sweetened condensed milk is non-negotiable. Regular milk and sugar don't deliver the same thick, caramel richness. The condensed milk is both the sweetener and the creaminess of this drink.
  • Try palm sugar syrup instead. For a more traditional Indonesian flavor, substitute gula aren (palm sugar) syrup for the condensed milk. Dissolve palm sugar in equal parts hot water to make the syrup, then add it to the drink.
  • Use large ice cubes. Larger ice cubes melt more slowly, keeping your kopi susu from getting watery too quickly.

Variations to Try

Es Kopi Susu Gula Aren (Palm Sugar)

Replace sweetened condensed milk with 2–3 tablespoons of gula aren (palm sugar) syrup. The deep molasses and caramel notes of palm sugar complement earthy Indonesian Robusta beautifully. This is the style used by many of Indonesia's popular modern kopi chains.

Es Kopi Susu Pandan

Add a few drops of pandan extract or simmer a pandan leaf in your palm sugar syrup. Pandan adds a subtle floral, vanilla-like fragrance that's quintessentially Southeast Asian.

Kopi Susu with Oat Milk

For a dairy-free alternative, use oat milk instead of condensed milk. You'll need to add separate sweetener (palm sugar syrup works well). The result is lighter and less sweet, but still delicious over ice.

Cold Brew Kopi Susu

Make a cold brew concentrate (coarse-ground coffee steeped in cold water for 12–16 hours in the fridge), then combine with condensed milk over ice. Cold brew produces a naturally sweeter, less acidic base that pairs beautifully with the richness of condensed milk.

A Drink That Tells a Story

Kopi susu is more than a recipe — it's a window into Indonesian coffee culture. It represents the Indonesian approach to coffee: unapologetically sweet, deeply satisfying, and meant to be shared. Whether you're making it from a single-origin Flores Arabica or a classic Lampung Robusta, every glass is a small celebration of Indonesia's extraordinary coffee heritage.