Sift flour, add butter, sugar, egg yolk and knead shortbread dough. Cover the dough with cling film and place in the refrigerator to rest for 2 hours.
Rinse the rice, let it drain. Bring milk with sugar and butter to a boil, add rice, boil for 15 minutes, remove from heat.
Beat cottage cheese with a blender until smooth, add candied fruits, zest, vanilla sugar, eggs, a pinch of salt and rice. Mix well until the ingredients are completely mixed.
Preheat the oven to 200 degrees. Roll out 2/3 of the dough into a layer, lay out the bottom and walls of the mold with it. Fill with rice curd mixture. Roll out the rest of the dough, cut into strips with a dough cutter and decorate the top of the cake with a lattice. Bake on the middle rack for about 50 minutes.
Sprinkle the cooled cake with powdered sugar.