Sari slice or Sari strudel

Ingredients: ; ; Dough: ; - 30 dkg plain flour ; - 15 dkg butter ; - 1 dcl milk ; - 1 dkg yeast ; - grated zest of 1 lemon ; - 4 egg yolks ; ; Walnut filling: ; - 4 egg whites ; - 15 dkg sugar ; - 15 dkg ground ; - 1 bottle of apricot jam ; ; Preparation: ; In the milk, stir the yeast with a little sugar, then knead it with the other ingredients into a smooth dough. Divide it into three parts and set aside to rest while you prepare the walnut filling. ; Beat the egg whites with the sugar until foamy, then carefully mix in the ground walnuts. ; Roll the dough into a rectangle, spread the two edges generously with jam, and roll it up, leaving 2 fingers of dough free in the middle. Spread the walnut mousse on the free part. That's it! Bake in a preheated oven at 180 degrees for 20-30 minutes. ; ;