Chocolate Walnut Buttercream - cooking recipe

Ingredients

1/4 lb. (4 sq.) unsweetened chocolate
2 Tbsp. very strong coffee
4 egg yolks
1/4 tsp. salt
1/2 c. sugar
1 c. butter (1/2 lb.)
1 c. broken walnut meats

Preparation

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.