Singaporean Fish Curry - cooking recipe

Ingredients

marinade
1/4 cup lemon juice (60 ml)
1/4 cup coconut vinegar (60 ml)
2 teaspoons cumin seeds
1 teaspoon ground turmeric
1 teaspoon cayenne pepper
1 teaspoon salt
other ingredients
2 lbs white fish fillets (1 kg, should hold well together)
1/4 cup oil (60 ml)
1 large onion, chopped
3 large garlic cloves, minced
2 tablespoons grated fresh ginger
1 teaspoon black mustard seeds
1200 g chopped canned tomatoes (1.2kg /2 1/2 lbs)
2 small green chilies, deseeded and chopped
2 tablespoons palm sugar, grated (or brown sugar)
3 -4 tablespoons chopped fresh coriander

Preparation

Mix all ingredients for the marinade in a bowl.
Check if all bones are removed from the fish fillets. If not, use a pair of tweezers.
Cut the fish into 1x4 inches pieces (2.5x10cm) and marinate for 30 minutes at room temperature or longer in the fridge.
Heat a wok on high temperature, put in oil. Reduce heat to the lowest temperature and add chopped onion, garlic and mustard seeds. Cook on very low heat for 5 minutes or more, stirring frequently.
Add fish fillets, marinade, tomatoes, chillies, and palm sugar (or brown sugar). Add a lid and cook for 10-15 minutes. Fish is cooked if it can easily be parted with a fork.
Serve over basmati rice and sprinkle with the fresh coriander.