Heat the oven to 200C/180C fan/gas 6. Cook the corn cobs in a pan of lightly salted boiling water for 10 mins. Drain and leave to cool slightly. Stand the cobs upright on a board and slice the kernels off using a sharp knife in a downward motion along the length of the cob.

Heat the olive oil in a large frying pan over a medium heat and cook the onion with a pinch of salt for 10 mins until golden and caramelised. Add the garlic, ginger, cumin, ground coriander, chilli and turmeric, and cook for 2 mins more. Tip in the coconut milk and tomatoes, then bring to a simmer. Arrange the cod fillets in a large roasting tin or casserole, then pour the spiced coconut and tomato mixture around the fish. Add the corn and prawns, and bake for 18-20 mins. Scatter with with fresh coriander and chillies and serve with rice and lime wedges on the side for squeezing over.