Knead a dough from flour, butter and sugar, salt and lemon and press it into a greased springform pan, prick a few times with a fork - bake in a preheated oven at 160 ° for about 15 minutes - then remove and spread the topping over it - Turn the temperature back to 140 ° and bake for about 15-20 minutes (egg whites should be light brown).
Covering:
Beat the egg whites firmly, let the sugar trickle in and whip up vigorously, put the currants under the finished snow.