Curried Fish Steaks

3 tablespoons oil or fat
2 tablespoons chopped onion
1 clove garlic
2 tablespoons curry powder
1 cup water or coconut milk
A little lime juice
Piece of green mango
Salt, to taste
1 1/2 pounds prepared fish steaks

Heat the oil, then add the onion and garlic and fry them lightly but do not brown. Add the curry powder, stir and cook for 3 to 4 minutes. Add water or coconut milk, lime juice and mango, and cook until thick. Put in fish and cook gently until tender. Do not stir fish, but prevent it from sticking to the bottom of the pan, the pan may be moved gently backward and forward.