1-1/2 pounds ground beef 1 tablespoon prepared horseradish 1/4 cup chopped onion 1/4 cup evaporated milk 1 teaspoon salt 1 teaspoon Worcestershire sauce 1/4 teaspoon pepper 6 hamburger buns 1 tomato, sliced for accompaniment Iceberg lettuce for accompaniment Preheat barbecue Read More …