INGREDIENTS
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3/4 cup all-purpose flour
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1 teaspoon coarse salt
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Pinch of white pepper (didn’t have, so didn’t use)
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2 teaspoons finely chopped fresh rosemary, plus extra sprigs for garnish
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3 tablespoons chilled unsalted butter, cut into small pieces
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1 cup finely grated (2 1/2 ounces) Parmigiano Reggiano cheese
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5 tablespoons sour cream
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1 large egg white, lightly beaten (optional — this is if you want to do the pretty rosemary garnish)