Melt butter at low heat. Put the rusk into a plastic bag, close the bag. Crumble finely with a rolling pin. Mix with the liquid butter
Lightly brush a cake plate with oil. Place a cake ring or springform pan rim (26 cm Ø) on top. Fill in the crumb mixture as a base and press it down. Chill for about 30 minutes.
Wash the currants and, except for a few for decoration, strip them from the stalks. Whip the cream until stiff. Mix mascarpone and quark briefly, pouring in sugar and cream thickener. Immediately fold cream and then currants carefully into the mascarpone cream. Spread on the cake base and chill for approx. 2 hours
Crumble meringue. Decorate the cake with meringue crumbs and currant pancakes