Burger KingŪ Zesty Onion Ring Sauce

1/2 cup mayonnaise
1 1/2 teaspoons ketchup
1 1/2 teaspoons prepared horseradish
1/2 teaspoon granulated sugar
1/2 teaspoon lemon juice
1/4 teaspoon ground cayenne pepper

Combine all ingredients in a small bowl. Cover and chill for at least an hour before using.