Tamarind prawn curry

Name: Tamarind prawn curry
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: Asian, Thai
Ingredients: 1tbsp vegetable oil; 1 onion chopped; 1 red chilli finely chopped; garlic cloves crushed; 1tbsp ginger; 1tsp turmeric; 1tsp cumin seeds; 1tsp ground coriander; 400g cherry tomatoes; 1tbsp tamarind paste (see tip, below); 250g raw king prawns; 250g cooked basmati rice; Handful of coriander leaves to serve