Chocolate Roll

Sift together the flour, salt, and cocoa powder

Add the lemon juice to the beaten egg yolks and beat until thick

Beat the egg whites until frothy

Gradually add the sugar to the egg yolks, mixing well

Add the egg yolks to the egg whites, folding gently

Turn onto a floured surface, kneading briefly

Shape into a roll and place on a baking sheet lined with parchment paper

Bake for 15 minutes, then turn onto a wire rack covered in confectioner's sugar

Trim the edges, re-roll, and let cool