2 med. onions
1 c. sliced mushrooms or 1 can mushroom buttons
1/4 c. butter
1-1 1/2 lb. fish fillets (sole, flounder, cod, haddock)
Salt & pepper
1/4 c. dry white wine

Cut onions into rings, saute in 3 tablespoons butter with mushrooms until soft. Place fish in greased baking dish. Sprinkle with salt and pepper. Spread sauteed mixture over fish, pour on wine. Dot with 1 tablespoon butter. Bake uncovered for 20 minutes or until fish flakes with fork. Serve with rest of white wine. Serves 4.