Active Time

　　20 min

　　Total Time

　　1 1/2 hours

Ingredients

　　1/2 cup mayonnaise

　　1/3 cup sour cream

　　3 tablespoons bottled white horseradish (not drained)

　　1 tablespoon white-wine vinegar

　　1 teaspoon sugar

　　3/4 teaspoon salt

　　1/2 teaspoon black pepper

　　1/3 cup chopped fresh chives

　　3 pounds cooked small (2-inch) boiling potatoes, cooled to room temperature and quartered

　　Whisk together mayonnaise, sour cream, horseradish, vinegar, sugar, salt, and pepper in a large bowl until smooth. Add chives and potatoes and stir to coat.