Mix the flour with sugar, cut cold butter into pieces and pour on top. Add the egg yolk and knead everything into crumbles. Put about 2/3 of the crumble in a quiche pan or casserole dish (the springform pan may leak a bit) and press it flat as a base.
Rinse the currants, mix with the vanilla sugar and fruit spread and spread on the bottom. Top with the rest of the crumble.
Bake in a preheated oven at 200 ° C (convection 170 ° C) for about 40 minutes. Serve lukewarm.