Diet Ocean Perch
["4 onions, sliced", "2 lb. fish fillets", "1/2 c. mayonnaise", "1 tsp. Worcestershire", "1 Tbsp. lemon juice", "1/2 c. grated Parmesan cheese", "2 Tbsp. chopped parsley"]
["Cook onions in salted water until tender.", "Spread drained onions in a shallow baking dish.", "Place fish on onions.", "Combine remaining ingredients.", "Spread over fish.", "Bake 30 to 40 minutes at 350\u00b0.", "Serves 6."]
["onions", "fish fillets", "mayonnaise", "Worcestershire", "lemon juice", "Parmesan cheese", "parsley"]