INGREDIENTS
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¾ cup unsweetened Dutch-process cocoa powder, such as Droste
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2 ½ cups powdered sugar
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1/8 tsp salt
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1 Tbs pure vanilla extract
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4 large egg whites, at room temperature
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1 ¾ cups walnuts, coarsely chopped
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¼ cup cocoa nibs, preferably Scharffen-Berger