Mix and knead all ingredients for the shortcrust pastry base. Pour into a springform pan lined with baking paper.
Tip: I always make the dough with the mixer and then press the streusel evenly into my springform pan.
Beat all the ingredients for the filling vigorously with the mixer (attention! It will be very liquid) and then pour it on the bottom.
Bake in the preheated oven at 175 ° C - 190 ° C for about three quarters of an hour.
Beat the 3 egg whites with the sugar until stiff and spread on the cake - either smoothly or in small waves. Bake the cake for another 15 minutes.
It is best to let it rest overnight and under no circumstances try to remove the cake from the pan - it is not yet firm. The next day, carefully loosen the edge with a small knife and then serve.