INGREDIENTS
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4 ounces/110 g shelled walnuts, plus more for decorating
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2 to 4 tablespoons fine breadcrumbs
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3 large eggs, at room temperature, separated
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1/2 cup/100 g granulated sugar
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4 tablespoons grated bittersweet chocolate, optional
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1/4 cup/60 g butter, melted until soft enough to pour but not oily
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1 tablespoon espresso, Cognac, Irish cream liqueur or other liqueur
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Confectioners' sugar, for serving
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Whipped cream and chocolate shavings, or coffee ice cream, for serving