"This is a classic Scandinavian-style smørrebrød...."
INGREDIENTS
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1/4 cup thinly sliced red onions
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1/4 cup red wine vinegar
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1 tablespoon sugar
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1/2 teaspoon kosher salt
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1/4 cup hot water
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12 slices pumpernickel bread
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1 teaspoon lemon zest
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1/4 teaspoon freshly ground black pepper
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1/2 cup crème fraîche
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12 ounces smoked trout
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Chervil or dill