1 1/2 lb. ground beef
1 envelope onion soup mix
1 c. water
1 c. ketchup
2 tbsp. firmly packed brown sugar
6 hamburger buns

In 10-inch skillet, brown ground beef over medium-high heat; drain. Stir in remaining ingredients, except hamburger buns. Bring to a boil over high heat. Reduce heat to low and simmer, uncovered, stirring occasionally, 8 minutes or until mixture thickens.