Place a piece of baking paper on the bottom of a square (24 x 24 cm) or round springform pan (26 cm Ø) and clamp it in the pan. Grease the bottom of the springform pan a little.
Finely chop the couverture and melt in a hot water bath with white plate-grease. Mix in the cornflakes thoroughly. Using a good 1/4 cornflakes mixture with 2 teaspoons, place 8 small heaps of crunchy crumbs on a piece of baking paper and allow to dry.
Spread the rest of the mixture as a cake base in the mould and press it down with your hands. Chill for about 1 hour.
Put about 8 cherries aside for decoration. Wash the remaining cherries, remove the stalks and stone them. Carefully remove the cake base from the springform pan, place it on a cake plate and close the edge of the pan again.
Stir mascarpone, quark, sugar, vanillin sugar, lemon peel and lemon juice only briefly so that the cream remains thick and creamy. Spread about 1/3 of the cream on the crispy base. Spread the cherries on top.
Spread the rest of the cream over the top. Leave to cool for at least 4 hours.
Wash the remaining cherries, dab dry and possibly stone them. Remove the cake from the rim of the mould and cut into pieces. Decorate half of the pieces with the cherries and the rest with crunchy piles.