1. Put the fish in a colander and pour boiling water over it. Drain well and put in a bowl. Add the onion, ground chili, fresh chilies, salt and pepper. Add enough lemon juice to cover. If bitter oranges are not available add more lemon juice. Cover tightly and allow to marinate about 3 hours until the fish is "Cooked- (white and not transparent). Serve garnished with corn and sweet potatoes cut in thick slices.