Coat a skillet with non-stick cooking spray; heat over medium high heat. Crumble in ground beef and cook for 8 mins.
Stir in tomato sauce, ketchup, vinegar, Worcestershire sauce and sugar. Simmer
on medium-low heat for 10 mins, stirring now and again.
Serve over hamburger buns.
For other variations:
Italian : Add oregano, Italian seasoning, mozzarella, and use marinara sauce instead of ketchup. Serve over a pizza shell instead of a bun.
Asian: Add 2 cloves of garlic, a half tsp. of ginger and substitute 2 tablespoons of light soy sauce for the Worcestershire sauce.