From Palembang in South Sumatra, these iconic fish cakes are made from a tender fish-and-tapioca dough wrapped around a whole egg, then gently boiled before being fried to a golden crisp. They are traditionally served with cuko, a punchy dipping sauce of palm sugar, vinegar, chilies, and shrimp paste that hits every note—sweet, sour, salty, and hot. The contrast of a crackly crust, bouncy cake, and jammy yolk makes this one of Indonesia's most beloved street foods.
Nutrition Facts
Per serving (estimated)
- 720 kcalCalories
- 38 gFat
- 6 gSaturated Fat
- 65 gCarbs
- 1 gFiber
- 28 gSugar
- 38 gProtein
- 760 mgSodium
- 580 mgPotassium
- 90 mgCalcium
- 3.5 mgIron
- 6 mgVitamin C
- 180 mcgVitamin A
Ingredients
For the fish cake dough
- 500 g mackerel or snapper fillets, skinned and boned
- 200 g tapioca starch (sago starch if available)
- 1 large egg
- 300 ml cold water
- 1 1/2 tsp fine sea salt
- 1/2 tsp ground white pepper
- 1 clove garlic, finely grated
For the filling
- 4 small raw eggs (duck eggs preferred)
For the cuko (spicy palm sugar sauce)
- 150 g palm sugar (gula merah), chopped
- 250 ml water
- 60 ml cane vinegar or rice vinegar
- 2 tbsp tamarind paste
- 1 tsp toasted shrimp paste (terasi)
- 5 cloves garlic, smashed
- 8-10 Thai bird's eye chilies, bruised
- 1/2 tsp salt
For frying
- Vegetable oil, for shallow frying (about 5 cm deep)
Directions
- Process the fish fillets in a food processor until a smooth, sticky paste forms, scraping down the sides once. Transfer to a large mixing bowl.
- Add the tapioca starch, egg, salt, white pepper, and grated garlic to the fish paste. Slowly drizzle in the cold water while kneading with your hand or a sturdy spoon until the dough comes together and feels smooth but soft; it should hold its shape without cracking.
- Divide the dough into 4 equal portions. Working one at a time, flatten a portion into a thick patty, press a deep hollow into the center with your thumb, and carefully slide in a raw egg. Mold the dough around the egg and pinch to seal completely, then shape into a smooth oval resembling a submarine. Repeat with the remaining portions.
- Bring a wide pot of water to a gentle boil. Lower the fish cakes into the water and cook for 12-15 minutes, or until they float and feel firm and bouncy when pressed. Remove with a slotted spoon and let cool completely on a tray.
- Meanwhile, make the cuko sauce: combine the palm sugar, water, vinegar, and tamarind paste in a small saucepan. Bring to a gentle simmer, stirring until the palm sugar fully dissolves.
- In a mortar or small bowl, mash the toasted shrimp paste, garlic, and chilies into a coarse paste. Stir this into the saucepan along with the salt. Simmer for 10-12 minutes until the sauce thickens slightly and coats the back of a spoon. Strain into a bowl and set aside to cool.
- Heat about 5 cm of vegetable oil in a deep skillet or wok to 175 °C (350 °F). Pat the cooled fish cakes dry with paper towels.
- Fry the fish cakes, one or two at a time, for 2-3 minutes per side until deep golden and crisp on the surface. Drain on a wire rack.
- Slice each fish cake on a bias into thick rounds to reveal the cooked egg yolk inside. Arrange on a plate and serve hot with the cuko sauce for dipping, alongside cucumber slices and a bowl of steamed rice.
Cook’s Notes
- Keep the dough cold: very cold water helps the tapioca stay snappy and prevents the fish proteins from over-binding into a rubbery texture.
- The fish cake must be fully cooked in the boiling water before frying—if it still feels soft in the center, give it a few more minutes until truly bouncy.
- Don't skip the shrimp paste (terasi)—toast it dry in a small pan first, then mash; it is the umami backbone of the cuko sauce.
- If palm sugar is unavailable, substitute dark muscovado sugar; the flavor will be slightly less caramel-like but still delicious.
- For a milder cuko, halve the chilies and remove their seeds; for extra heat, bruise a couple more into the simmering sauce.










