Combine ground beef, Lipton Recipe Secrets Mix, breadcrumbs, onions, brown sugar, ketchup, mustard, egg and milk in a large mixing bowl. Use your hands to mix until well blended.
1 1/2 pounds ground beef, 1 package Lipton Recipe Secrets Mix, 2/3 cups breadcrumbs, 1/2 small onion, 1 1/2 tablespoons brown sugar, 1/4 cup ketchup, 1 tablespoon prepared mustard, 1 egg, 1/2 cup milk