Beat 1 1/3 cups soft butter until light and fluffy. Blend in 5 cups confectioners' sugar, 1/2 cup milk and 2 tsp instant coffee; beat until smooth. Cover; refrigerate until mixture is of spreading consistency.
Fills and frosts two 8 or 9" layers
1 pkg (10 oz) frozen cranberry-orange relish
1 pt. vanilla ice cream
4 thin orange slices
Cut frozen relish into 1" cubes. Cut ice cream into chunks. Place relish and ice cream in blender. Cover; mix on lowest speed 1 minute.
Stop blender occasionally; scrape side of container with rubber...