1-2 tablespoons of warm water, as needed to get a good consistency
Instructions
In a large bowl, cream together the butter, shortening, coffee and vanilla until smooth.
In a separate bowl, sift together the cocoa powder and powdered sugar, then slowly add to the creamed mixture.
Add warm water as needed to the frosting to thin it for piping or frosting a cake.
Use immediately or cover and chill until ready to use. When ready, bring it to room temperature to soften and mix with a hand mixture to fluff it up before using.
This recipe yields about 3 cups of dark mocha buttercream frosting or enough to cover and fill a 2-layer 6″ round cake.