This old fashioned shiny fudge frosting is the perfect way to finish off a chocolate cake. The frosting, is soft, chocolaty and has a nice sheet. You are going to love it.
In a large saucepan, melt ½ cup butter over medium-low heat.
Stir in 1½ cups granulated sugar, 1¼ cups cocoa powder and ½ teaspoon salt.
In a separate bowl, stir together 1¼ cups heavy whipping cream, ¼ cup sour cream and 1 teaspoon instant coffee until smooth.
Continuing to heat over medium-low heat, slowly add the cream mixture to the cocoa mixture. Stir until each addition is incorporated, then add more until the cream mixture is gone.
Keep heating for another 5-6 minutes, being careful not to bring the mixture to a boil
Remove icing from heat and stir in 1 teaspoon vanilla extract. Allow to cool at room temperature for at least a couple of hours or until spreading consistency.
Once the frosting is thick enough to stay in place, spread on cooled cake.
Notes
You can hasten the cooling process by putting the frosting in the refrigerator. If it becomes too thick to spread, warm up in the microwave 10 seconds at a time. Stir after each 10 second interval and continue until you reach the desired consistency.