Sloppy Sloppy Joe
In large iron skillet on medium-high heat, cook ground beef along with onion until meat is browned, about 10 minutes. Stir frequently to break meat up into small clumps. Spoon off excess fat. Add tomato sauce and 1/2 cup water. Reduce heat to medium-low and simmer uncovered for 10 minutes, stirring occasionally.
Stir in sloppy joe mix. Simmer about 5 more minutes, stirring often, until mixture is thick but spoonable. Thin with a little additional water if it is too thick - simmer to reduce it a little more if too thin. Salt and pepper to taste. Spoon some of the mixture over bottom half of each roll. Top with optional lettuce and cover with top half and pick up to eat. Makes 4-8 servings.