Salsa:
3 onions, finely chopped
3 tomatoes, chopped
2 tsp. salt
3 tbs. olive oil
juice of 1 lime
2 fresh chili peppers, seeded and minced

Grease a large piece of aluminium foil and wrap the fish with it. Grill the fish over hot coals. Let it cook for about 30 to 40 minutes. Remove from the heat and very carefully unwrap the fish. Transfer to a platter and serve with a salsa made with the onions, tomatoes, chili peppers, salt, olive oil and lime.