Baked Fish Fillet Casserole
["3 Tbsp. olive oil", "3 lb. thick fish fillets", "1 onion, sliced into thin slivers", "3 fresh tomatoes, sliced lengthwise", "1 medium zucchini, sliced into 1/4-inch slices", "3 Tbsp. basil or parsley, chopped", "salt and pepper to taste"]
["Preheat oven to 425\u00b0 and butter casserole dish.", "Lay fillets in dish.", "Sprinkle sliced onion over fish.", "Lay tomato slices, alternating with zucchini, down middle of fish.", "Place more tomato slices around the edges of casserole dish.", "Brush fish and vegetables with remaining oil.", "Bake for about 20 minutes until done.", "Sprinkle with salt, pepper and chopped herbs.", "Serves 6 to 8."]
["olive oil", "thick fish", "onion", "tomatoes", "zucchini", "basil", "salt"]