2 pounds 90/10 ground beef
1 bottle (14 ounces) ketchup
½ of the ketchup bottle of water
1 Tablespoon white vinegar
1 medium onion, chopped
1½ teaspoons sugar
2 Tablespoons mustard
1½ Tablespoons Worcestershire sauce
Brown ground beef; drain. Add remaining ingredients. Cook over medium heat, stirring frequently until heated through and flavors have integrated, about 10 to 15 minutes.
Serve on your choice of sandwich roll, or eat it with a fork.