COOK hamburger and onion in skillet, STIRRING frequently, until browned; DRAIN grease and discard.
COMBINE the remaining ingredients, ADD to hamburger mixture, STIR, and SIMMER for 10 minutes.
SERVE hot on hamburger buns.
May substitute 1 tablespoon prepared mustard for mustard powder
Per Serving (excluding unknown items): 416 Calories; 15g Fat (31.9% calories from fat); 17g Protein; 56g Carbohydrate; 1g Dietary Fiber; 44mg Cholesterol; 1058mg Sodium. Exchanges: 2 1/2 Grain(Starch); 1 Lean Meat; 1/2 Vegetable; 2 1/2 Fat; 1 Other Carbohydrates.