make 3 eggs worth of lady finger the day ahead
soften mascarpone cheese, beat up (by hand or with mixer) with powdered sugar till smooth pour in heavy cream and beat up
divide into halves for the chocolate half: add cocoa powder and kahlua beat up (if overbeaten, add some heavy cream)
prep coffee syrup for dipping make coffee, add sugar to taste, add rum extract
assemble [ dip lady fingers to coffee syrup and lay out a layer pour in mascarpone batter sift cocoa powder grate chocolate ] repeat
put in fridge for 2 – 5 hours (or overnight) to chill before serve