The evening before, lay out the cantucchini on a tart platter with a rim or in a baking dish and sprinkle with 12–14 tablespoons of amaretto. Let it steep overnight.
The next day, mix the mascarpone with the egg yolk, powdered sugar and 3-4 tablespoons of amaretto (but make sure that the whole thing doesn`t get too runny). Spread the mixture on the cantucchini, cut the peaches or apricots into slices or place them on top as half fruits.