6 medium potatoes, cubed
1/2 cup vegetable oil
2 tablespoons white vinegar
2 tablespoons ketchup
2 tablespoons prepared horseradish
2 tablespoons mayonnaise
2 tablespoons brown sugar
1 onion, thinly sliced
1/3 cup barbecue sauce
Preheat oven to 425 degrees F (220 degrees C). Divide the potatoes into two large pieces and rub them in the oil and vinegar. Sprinkle evenly with ketchup, horseradish, mayonnaise, brown sugar, onion and barbecue sauce.
Bake in preheated oven for 1 hour, or until potato is tender.