Put Shortbread in a freezer bag and crush it finely with a dough roll. Melt butter and mix well with the cookie crumbs. Spread the bottom of a springform pan (18 cm Ø) thinly with oil. Spread the crumb mixture on the base and press it down to an even base. Chill for about 30 minutes.
Soak gelatine in cold water. Wash 350 g strawberries, drain well and clean. Puree the strawberries. Weigh 80 g strawberry puree and mix with 1 tsp. sugar. Squeeze 1 sheet of gelatine, dissolve and mix with the strawberry puree. chill for 10-15 minutes
Whip the cream until stiff. Mix mascarpone, quark, 75 g sugar, vanillin sugar and 250 g strawberry puree. Squeeze 6 sheets of gelatine and dissolve. Stir about 2 tbsp. cream into the gelatine, then stir the gelatine mixture into the remaining cream. Fold in the cream. Put about half of the mascarpone cream into the springform pan. Spread half of the strawberry puree on top and fold in loosely with a fork. Add the rest of the cream and the remaining strawberry puree and marble with a fork as well. It is best to put the cake in a cool place overnight
Chop the couverture and melt separately over a warm water bath. Wash the remaining strawberries (3-4 pieces) and dab dry. Dip the strawberries in white and dark chocolate coating as desired, drain a little and place on baking paper. Let dry in a cool place. Remove the cake from the mould and decorate with chocolate-strawberries
Preparation time approx. 45 minutes. waiting time approx. 12 3/4 hours