Season fish with marinade and place on a heat-proof dish.
Heat oil and fry curry leaves until fragrant. Add spice ingredients A & B, and sauté until aromatic.
Mix in asam jawa juice and seasoning. Fry for a while. Dish out.
Pour sautéed Nyonya spice ingredients over the fish. Place the fish in a steamer and steam over rapid boiling water for about 10-15 minutes or until fish is cooked. Remove the dish out and garnish before serving hot.