Spread the bottom of a square springform pan (24 x 24 cm) thinly with oil. Melt butter. Put the lady fingers in a large freezer bag and crush them finely with a rolling pin. Mix breadcrumbs and butter well and sprinkle evenly into the tin, except for 2-3 tbsp. Press to a smooth base and chill for about 15 minutes.
In the meantime, sort out the raspberries. Whip cream until stiff. Mix quark and 50 g sugar. Stir in sauce powder, add cream immediately and stir in. Spread about 1/3 vanilla quark on the crumb base immediately. Spread raspberries on top and cover with the remaining quark cream quickly. Mix cake glaze powder and 2 tbsp. sugar in a pot. Gradually stir in 1/4 litre of cold water. Bring to the boil while stirring and quickly spread on the quark cream.
Mix cake glaze powder and 2 tbsp. sugar in a pot. Gradually stir in 1/4 litre of cold water. Bring to the boil while stirring and quickly spread on the quark cream. Chill the cake for about 1 hour. Remove the cake from the springform pan and cut into pieces. Decorate as you like with a blob of whipped cream, raspberries and the remaining sponge crumbs
Waiting time 1 hour