In skillet, cook
onion in 1/4 cup butter till tender, but not brown.
Stir mushrooms into skillet with flaked crab, cracker
crumbs, parsley, 1/2 teaspoon salt, and pepper.
Spread over flounder fillets. Roll the fillets and
place, seam-side down in 12 x 7-1/2 x 2 inch baking
dish. In saucepan, melt 3 tablespoons butter. Blend
in flour and 1/ 4 teaspoon salt. Add enough milk
to mushroom liquid to make 1 and 1/2 cups. Add with
wine to saucepan. Cook and stir until thickened
and bubbly. Pour over filets. Bake in hot oven (400)
for 25 minutes. Sprinkle with cheese and paprika.
Return to oven. bake 10 minutes longer, or till
fish flakes easily with fork. Serves 8.