Chocolate Walnut Buttercream

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   ["Set a mixing bowl in a basin of simmering water.", "Add the chocolate and the coffee; heat, stirring often, until chocolate is blended and melted.", "Combine the yolks, salt and sugar in another bowl.", "Set the bowl in a basin of simmering water and beat the yolk mixture rapidly with a wire whisk.", "Beat until it falls in a ""ribbon"" when the whisk is lifted.", "Spoon the chocolate into the yolk mixture.", "Return the bowl to the simmering water and continue beating.", "Gradually add the butter; beat.", "Remove the bowl from the heat.", "Continue beating until the mixture thickens and becomes spreadable.", "Add walnuts.", "Cool.", "Spread over the 2 cakes. Decorate with the 12 large walnuts."]

* Per serving · 4 servings · Values may vary.