Joy of Cooking Barbecue Sauce

1 1/2 cups ketchup
1 cup red wine vinegar
1/4 cup worcestershire sauce
1/4 cup soy sauce
1 cup packed light brown sugar
2 tablespoons dry mustard
4 tablespoons chili powder
1 teaspoon ground ginger
2 minced garlic cloves
2 tablespoons vegetable oil
3 slices lemons

Over medium heat stir all of the ingredients together.