By Flo Braker
This is really cream-cheese buttercream with whipped cream added to make it a delectable filling.
It is for the filling of Lucerne Cheese Torte.
In a 2- to 3-quart mixing bowl manipulate the cream cheese with a rubber spatula until smooth. Gradually add the butter, stirring until smooth and homogeneous. Lastly, stir in the sour cream and lemon zest; set asi