Red Lobster's Crab Au Gratin

8 tablespoons (1 stick) butter
1/2 cup onion, minced
2 tablespoons all−purpose flour
1 cup milk, scalded
1/2 teaspoon salt
dash of white pepper
1/4 cup sherry
12 ounce crab meat
1 cup crackers, finely crumbled
1/2 cup cheddar cheese, finely grated
1) Crumble crackers between waxed paper with a rolling pin. Reserve just
enough crumbs and cheese to top the casserole.
2) Melt 4 tablespoons of the butter in a large heavy skillet.
3) Add onion and saut for about 5 minutes or until golden.
4) Slowly add flour, stirring constantly over low heat.
5) When flour is blended, gradually add hot milk (scalded) and blend with a
whip.
6) Continue stirring over low heat until the sauce begins to thicken.
7) Add salt, pepper, and sherry, and continue stirring in a bowl.
8) Mix crab meat, sauce, and the extra cracker crumbs and cheese.
9) Place in a lightly greased baking dish.
10) Sprinkle reserved cracker crumbs and cheese on the top of the casserole.
11) Dot the top with the remaining 4 tablespoons butter.
12) Bake uncovered at 350F for about 15 minutes or until the top is golden
brown.