INGREDIENTS
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2/3 cup walnut pieces
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1/2 cup granulated sugar
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1/2 cup butter
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1 2/3 cup semisweet chocolate chips (10 ounces) or 1 3/4 semisweet chocolate wafers (10 ounces). See note.
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8 large egg whites
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8 large egg yolks at room temperature
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1 teaspoon vanilla extract