"Pickled red onion adds crunch and punch. Serve with crudités...."
INGREDIENTS
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5 tablespoons finely chopped red onion
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1/4 cup white wine vinegar
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1 teaspoon sugar
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Pinch of kosher salt plus more
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1/4 cup buttermilk
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1/4 cup sour cream
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2 tablespoons chopped fresh chives
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1/2 cup crumbled blue cheese
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Freshly ground black pepper