2. Melt Crisco in a heavy saucepan over medium heat. Stir in onion. Cook until tender, stirring occasionally.
3. Stir in mushrooms; cook 2 to 3 minutes longer. Remove from heat. Stir in parsley, salt, and lemon juice.
4. Thaw frozen fish; rinse and pat dry. Place in a greased 11 x 7 x 1-1/2-inch pan or broiler-proof serving platter. Spoon vegetable mixture over fish. Pour wine over all.
5. Bake for 20 minutes or until fish flakes easily. Serve with lemon and lime wedges.