Maryland Crab Meat Casserole ½ cup butter3 tablespoons flour2 cups milk2 tablespoons onion, minced¼ teaspoon lemon zest1 tablespoon pimento, minced1 tablespoon greenpepper, minced½ teaspoon celery salt1 teaspoon salt½ teaspoon pepper1 egg, beaten3 cups crab meat½ cup...