Seafood Casserole

Ingredients

• 1/3 cup butter
• 1/3 cup flour
• 2 teaspoons prepared mustard
• 1/2 teaspoon salt
• 1/2 teaspoon paprika
• 2 teaspoons brown sugar
• 1 tablespoon onion, grated
• 3 cups milk
• 6 ounces Cheddar cheese, shredded
• 6 1/2 ounces flaked crabmeat
• 1, 6 ounce can lobster
• 1 pound shrimp, fresh cooked
• 1/4 cup bread crumbs