Fish Caldine (Yellow Fish Curry)

Yield:	1 Servings
Categories:	Goanese

1/2	kg	Fleshy fish steaks (prawns may be substituted)
1		Coconut
1/4	ts	Cummin seeds
6		Peppercorns
2	ts	Coriander seeds
1		1-inch piece turmeric -or-
1	ts	Ground
2		Onions, sliced
1		Tomato , sliced
2	tb	Oil
2		Green chillies sliced lengthways (or more if desired)
		Salt and vinegar to taste