Radish and Cabbage Salad with Buttermilk Dressing

Recipe from food blog "Smitten Kitchen".
Serves 6

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

Preparation 
Whisk together buttermilk, mayonnaise, vinegar, shallot, sugar, 1/2 teaspoon salt, and 1/4 teaspoon pepper in a large bowl until sugar has dissolved, then whisk in chives.
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Toss cabbage, radishes, and celery with dressing.