INGREDIENTS
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1/3 cup sour cream
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1/3 cup mayonnaise
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1/4 cup extra-virgin olive oil
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3 Tbs. lemon juice
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2 Tbs. grated fresh or strained jarred horseradish
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1 tsp. kosher salt
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1/2 tsp. freshly ground black pepper
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1/4 cup plain rice vinegar
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Kosher salt
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3-1/2 lb. medium waxy potatoes, such as Yukon Gold or red, scrubbed clean
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1/2 cup shredded hot-smoked trout
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1 cup small-diced sweet onion
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3/4 cup sliced chives