Barbecued Beef Buns

Ingredients

950 gr beef
240 ml ketchup
120 ml cider vinegar
110 gr butter
50 gr sugar
2 slices onions thinly
2 slices lemon
30 ml worcestershire sauce
20 ml prepared mustard
3 gr salt
1 gr chili powder
1 gr black pepper
120 ml water
8 hamburger buns

Instructions

Combine all of the ingredients, except the hamburger buns, in a 4 litre Dutch oven. Cook over high heat until the mixture comes to a boil. Reduce the heat to low and simmer for 25 minutes or until the mixture thickens. Remove the lemon slices. Pour into a container, cover and refrigerate. TO SERVE: Warm over medium heat and serve in the hamburger buns.