Combine Mascarpone(or egg yolks) and sugar and whip.
Add whipped cream to abouve whipped mixutre. Fold in slowly until combined and set aside.
Take lady finger biscuits and dip or brush with coffee. Spoon half of the cream filling over the lady fingers. Repeat ladyfingers, coffee and filling layers. Garnish with cocoa and chocolate curls. Refrigerate several hours or overnight.
To make the chocolate curls, use a vegetable peeler and run it down the edge of the chocolate bar. Or just use grated chocolate.