Goan Prawn Curry

For the curry paste:

1 tsp whole or ground black peppercorns

1 tsp whole or ground cumin

1 tbsp whole or ground coriander

1 tsp chilli powder or 4 dried red chillies

1 tsp ground turmeric

1 tsp brown sugar

juice of half a lime

40g desiccated coconut

250 ml coconut milk

For the curry:

2tbsp coconut oil

1 onion

6 cloves of garlic

2 cm fresh ginger root

250g tomatoes

1 tsp salt

200g raw king prawns

6 leaves of fresh basil