napa cabbage salad with buttermilk dressing

INGREDIENTS

• 1/2 cup well-shaken buttermilk
• 2 tablespoons mayonnaise
• 2 tablespoons cider vinegar
• 2 tablespoons minced shallot
• 1 tablespoon sugar
• 3 tablespoons finely chopped chives
• 1 pound Napa cabbage, cored and thinly sliced crosswise (4 cups)
• 6 radishes, diced
• 2 celery ribs, thinly sliced diagonally