Manwich sloppy joe mix is basically tomatoes, green pepper, and onions with spices in it. It's been around a long time. I remember it being new and exciting in the 70s. The jingle used at the time was A sandwich is a sandwich, but a Manwich is a meal. Later, in the 80s, the memorable commercial was a bunch of kids marching around singing something about Don't give me no baloney mom, I want a Manwich meal.
Recently, as I'm now cooking food that kids will eat, I rediscovered Manwich. It's convenient in the manner that canned spaghetti sauce is. You can open the can and pour it over most anything and kids will eat it. I am somewhat surprised that the original name has survived however. In the past few months, I've cooked several successful meals (success being measured in the absence of complaining) using Manwich sauce and various meats.