Creamy Cauliflower "Potato" Salad

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Kosher salt and freshly ground black pepper

1 pound cauliflower florets (from about 1 small head cauliflower)

2 tablespoons sour cream

2 tablespoons prepared horseradish

2 tablespoons mayonnaise

2 tablespoons chopped fresh chives

1 tablespoon cider vinegar

2 stalks celery, chopped into 1/4-inch pieces