Michigan Hot Dog Sauce

Source: Woodie's Ticonderoga Bicentennial Cookbook via Cindy
adapted by http://theresalwaysthyme.blogspot.com

1 medium onion, chopped
2 tablespoons butter
2 tablespoons wine vinegar
2 tablespoons brown sugar
4 tablespoons lemon juice
1/2 teaspoon dry mustard
3 teaspoons Worcestershire sauce
dash cayenne pepper (optional)
1 cup ketchup
1/2 pound hamburger meat

Cook onions until soft, add remaining ingredients. Cook until meat is completely cooked and is the desired consistency you like!