Fish curry with tamarind

Name: Fish curry with tamarind
Cuisine: Asian, Indian
Ingredients: 60ml coconut oil; 2 large onions; 2 garlic cloves; 2.5cm fresh ginger; 1 1/2 tsp curry powder; 1/2 tsp ground tumeric; 1/2 tsp pepper flakes; 411g canned tomatoes (diced); 120ml vegetable stock; 20g fresh cilantro; 2 tbsp tamarind paste; 1 tbsp fresh lime juice; 910g fish fillets (bass, snapper, flounder, hake)