Thaw tails overnight in refrigerator. Open flat - so underside of tails are up. Split down center of tail, open up and remove intestinal vein. Mix 2 cups Ritz cracker crumbs with 1 cup melted butter, 2 (beaten) eggs, 2 tablespoons Parmesan cheese (optional). Optional: add 1/4 cup fresh crabmeat, crumbled and/or 1/4 lb. cup up scallops. Mix all - stuff tails. Brush with butter. Preheat oven to 450 degrees. Bake on cookie sheet 20 minutes. Serve with side of melted butter.