1. Whisk together the cream and icing sugar until it forms soft peaks.
2.In a separate bowl, stir the mascarpone with a wooden spoon to soften it, then gradually beat in the single cream mixture. Between each addition, beat well until the mixture is smooth before adding more.
3.Then pour the coffee into a shallow dish and then dip the sponge fingers briefly into it, turn them over quickly. They will absorb the liquid very quickly. Layer the desserts by putting the soaked sponge fingers into each glass, followed by a tablespoon and a half of the mascarpone mixture and a layer of chopped chocolate.
4. Repeat the whole process, putting the soaked sponge fingers in next, followed by the mascarpone, finishing with a layer of chopped chocolate and a final dusting of cocoa powder. Cover the glasses with cling film then chill in the refrigerator for at least 4-6 hours and serve very cold.
*You can plate the dessert however you wish, in individual glasses or as a single dessert in a serving dish.