Tiramisu with Sake Lees

Ingredients
100g sake lees (leftovers from Japanese sake production)
200g cream cheese
80g beet sugar
2 egg yolks
100ml heavy cream

4 prunes soaked in sake
A little of the liquor in which the prunes were soaked
5 slices sponge cake

A dash of cocoa powder

*How to make "soaked prunes in liquor":    • #921『プルーンの洋酒漬け』紅茶とバニラとカルバドスの香りで！｜シェフ三...