1 lb. 90% lean ground beef
1 cup dried bread crumbs
1/2 cup diced yellow onion
1/2 cup milk
1 large egg (beaten)
2 tbsp. ketchup
1 tbsp. Worcestershire sauce
1 tsp. dried parsley leaves
3/4 tsp. salt
1/2 tsp. garlic powder
1/4 tsp. ground black pepper
For the Topping:
1/4 cup ketchup
2 tbsp. packed light brown sugar
1 tbsp. red wine vinegar