INGREDIENTS
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2 pounds purple-skinned fingerling potatoes, quartered lengthwise
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1 head garlic, halved crosswise
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Pinch of red pepper flakes
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5 tablespoons apple cider vinegar
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Kosher salt
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1 red onion, halved and thinly sliced
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1 teaspoon sugar
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1/2 cup mayonnaise
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4 tablespoons sour cream
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1/3 cup horseradish, drained
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2 stalks celery, thinly sliced
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4 half-sour dill or sweet pickles, diced
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3 tablespoons chopped fresh dill
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2 tablespoons chopped fresh parsley
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Freshly ground pepper