Grate 2 oz of chocolate on a cheese grater using the smaller hole.
Set aside a 9 inch square baking dish (or similar). Place your landy fingers, coffee mixture, mascarpone, and shaved chocolate close by.
Take half of the lady fingers and individually dip each in the coffee mixture very quickly (the lady fingers will absorb the coffee quickly.... you do not want them to get too soggy). Place dipped biscut in the bottom of the baking dish. Continue dipping lady fingers and placing them in the baking dish until the bottom is fully lined. You may have to break a few biscuts in half in order to fully line the bottom. That is okay- nobody will know! It is more important for the bottom to be fully covered.
Spoon half of the mascarpone mixture over the lady fingers. Use a spatula to carefully smooth it out evenly. Sprinkle half of the grated chocolate over the mascarpone.
Repeat with remaining lady fingers, mascarpone, and grated chocolate for the second layer.
Cover with plastic wrap and place in the refrigerator for at least 6 hours (or overnight).
Before serving: let sit at room temperature for about 20 minutes. If needed, sprinkle with more chocolate (always recommended). You can also add chocolate curls, see notes.
Enjoy within 2 days for best flavor and texture. After that, it will start to get soggy.