Sloppy Joes

2 lbs hamburger beef
1 large chopped onion
1 ¼ C ketchup
½ C water
1 T brown sugar
1 T white vinegar
½ tsp salt
½ tsp ground mustard
½ tsp chili powder
¼ tsp ground allspice
Cook beef & onion drain. Add other ingredients. Bring to a boil and then reduce heat and simmer.