Fish mappas

Name: Fish mappas
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: Indian
Ingredients: 300g basmati rice; 1 tbsp sunflower or vegetable oil; 2 large onions sliced; 2 garlic cloves chopped; 450g tomatoes cut into chunks; 3 tbsp tikka curry paste; 400g can coconut milk; 4 skinless, boneless pollock fillets (about 150g/51/2oz each), or other sustainable white fish, cut into 4cm/11/2in chunks; ½ small pack coriander roughly chopped