Quick prawn curry

Name: Quick prawn curry
Cook time: 10 min
Total time: 10 min
Cuisine: Asian, Indian, Thai
Ingredients: 2 tbsp curry paste (we used Patak's Origional Balti curry paste); 1 onion finely sliced; 200g large raw or cooked prawns defrosted if frozen; 400g can chopped tomatoes with garlic; large bunch coriander leaves and stalks chopped