"New York pastry chef François Payard's divinely gooey chocolate cookies are flourless, which makes them ideal for Passover baking...."
INGREDIENTS
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2 3/4 cups walnut halves (9 ounces)
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3 cups confectioners' sugar
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1/2 cup plus 3 tablespoons unsweetened Dutch-process cocoa powder
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1/4 teaspoon salt
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4 large egg whites, at room temperature
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1 tablespoon pure vanilla extract