Old Fashioned Chocolate Cake Icing
Melt butter in a large saucepan over medium heat.
Stir in sugar, cocoa, and salt.
Combine heavy cream, sour cream, and instant coffee in a large measuring cup, mixing until smooth. Gradually add cream mixture to chocolate until blended and smooth. Cook until the sugar has dissolved and the mixture is smooth and hot to the touch, 6-8 minutes. Do not boil.
Off heat, add vanilla. Cool icing at room temperature until spreadable, 2-3 hours. (Icing may be chilled until completely cold, then warmed gently in microwave until spreadable. Heat at high power in 20-second intervals, stirring well after each interval.
1 stick of unsalted butter
1 1/2 cups of sugar
1 1/4 cups of unsweetened coca powder
Pinch of salt
1 1/4 cups of heavy whipping cream
1/4 cup sour cream
1 tsp. instant coffee granules
2 tsp. vanilla extract