INGREDIENTS
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2 envelopes (2 scant tablespoons) active dry yeast
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3/4 cup warm water (110 degrees)
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3 1/4 cups all-purpose flour, plus more for surface
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2 tablespoons warm buttermilk (110 degrees)
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1/2 cup sugar
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1 teaspoon salt
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6 large egg yolks
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4 tablespoons (1/2 stick) unsalted butter, melted and cooled
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Vegetable-oil cooking spray
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Vegetable oil, for deep-frying
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1 cup superfine sugar, for coating