Fish with tomatoes and bell peppers

Cut 2 or 3 onions in halves, than slice finely. Slice 4 or more cloves of garlic and two green bell peppers. Saute all in olive oil, add 1 tin chopped tomatoes or equal amount or fresh tomatoes, peeled and sliced, 1 tb sp. of harissa (paste of mixed spice from the Maghreb, if not available, no problem, use more spices instead) or more, 1/4 tsp. cinnamon, 1/2 tsp. cumin and 1 tsp. chili powder and salt, mix well and bring to boil.  
Put one layer of sauce in baking form, alternate with layer of slightly salted and peppered white fish pieces, top layer should be sauce. Sprinkle with parsley and bake in oven. Serve with bread or saffron rice.  
Instead of tomatoes add 1/2 cup wine and 1 cup water mixed with tomato concentrate.  
Use more bell peppers (any colour), green chilies and sliced mushrooms.