Ingredients

8 ounces whipped unsalted butter, softened 

Pinch of salt 

2 cups sifted confectioners' sugar 

1 egg yolk 

4 tablespoons heavy cream 

4 tablespoons cognac 

Preparation

Put ingredients in a food processor and mix until smooth and creamy. Put sauce in tightly covered jar. Refrigerate.

Remove from refrigerator at least 1 hour before serving.