Pour the peaches into a sieve, drain. Cut the peaches into pieces. Put peaches and liqueur in a bowl and marinate for about 1 hour. Separate the egg. Beat the beaten egg whites until stiff, pouring in sugar.
Fold the egg yolk into the beaten egg white. Mix flour, starch and baking powder, sieve onto the mixture and fold in. Finally, fold in 2 tablespoons of poppy seeds.
Pour the mixture into a piping bag with a medium-sized punched spout. Spray small tuffs (approx. 2 cm Ø) onto 2 baking trays lined with baking paper at a distance and sprinkle with remaining poppy seeds. Bake in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) Bake for 5-8 minutes. Remove from the oven, remove the tuffs from the baking paper and let them cool down.
Mix mascarpone, honey and sour cream. Whip cream until stiff and fold in. Coarsely mash the peaches. Pour cream, sponge cake and peach puree into glasses and serve immediately.