We called these Maid Rites, Barbecued Hamburger or Sloppy Joes

2 lbs. ground beef (browned)
1 onion
1 c. catsup
2 TB vinegar
2 TB brown sugar
1/4 c. lemon juice
2 TB. Worcestershire sauce
1/2 tsp. prepared mustard
Salt & pepper to taste
(Add flour if you need to thicken)

Here is our current favorite.

Pizzaburger
1/4 c. onion
1 lb. ground beef (browned)
1 can condensed tomato soup
1/2 c. shredded sharp cheese
1/8 tsp. oregano
Dash of pepper

From Cooking With Soup; Campbell