INGREDIENTS
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1 1/4 cups walnut pieces
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1 tablespoon unsweetened Dutch-processed cocoa powder
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8 ounces bittersweet or semisweet chocolate
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3/4 cup unsalted butter
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6 large egg yolks
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3/4 cup light brown sugar (packed)
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1 tablespoon dark rum or grappa
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1/2 teaspoon Kosher salt (plus a pinch)
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3 large egg whites
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1 tablespoon granulated sugar (plus 1 teaspoon)
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WHIPPED CREAM (TO SERVE):
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1/2 cup heavy whipping cream
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2 tablespoons sugar
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1/2 teaspoon vanilla extract