Melt butter, stir in flour; cook 5 minutes or until brown, stirring constantly. Add paprika and pepper; cook for 3 minutes. Add salt, green pepper, onion and garlic; cook for 5 minutes. Remove from heat and add lemon juice, Worcestershire sauce, oysters and liquor from oysters. Pour into baking dish and sprinkle with cracker crumbs. Bake at 350 degrees for 30 minutes.