1. Beat the mascarpone, cream, yolks and sugar together until thickened. Combine the coffee, extra sugar and marsala together and allow to cool.
2. Lightly dip 1/2 the biscuits in the coffee syrup and layer in the bottom of a serving dish. Spread half the mascarpone mixture on top and top with strawberries.
3. Layer remaining biscuits dipped in syrup and mascarpone on top. Dust with cocoa and refrigerate for at least 1 hour before serving.