INGREDIENTS
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2 shallots, 1 coarsely chopped, 1 thinly sliced into rings
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4 scallions, white and pale-green parts only, thinly sliced
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1 tablespoon Champagne vinegar or white wine vinegar
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Kosher salt
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1/4 cup mayonnaise
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1/4 cup sour cream
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2 tablespoons buttermilk
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2 tablespoons finely chopped fresh chives
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Freshly ground black pepper
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1/4 cup vegetable oil
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3 tablespoons porcini powder, divided
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1 tablespoon kosher salt
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Vegetable oil (for frying; about 6 cups)
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1/2 cup all-purpose flour
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1/2 cup cornstarch
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1/2 teaspoon baking powder
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1/4 teaspoon kosher salt
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1 cup chilled club soda
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8 ounces green beans, trimmed
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A deep-fry thermometer