Alabama White Sauce

1 cup mayonnaise
1/2 cup vinegar
1/4 cup apple juice
1 teaspoon prepared horseradish
1 teaspoon black pepper
1 teaspoon lemon juice
1/2 teaspoon salt
1/4 teaspoon cayenne pepper

Put all ingredients in a blender and blend for 1 minute.
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I think this might also be very good if the apple juice were to be replaced with one (or more) of the following:

Peach juice or a cup crushed fresh peaches
Orange juice or marmalade
Strawberry juice or preserves
Grape juice of jam/jelly

(OK, I admit that it might not be very white with the last two. But still good, I suspect.)