Add the eggwhite and butter and mix well to combine. Pour into a lightly greased 25cm-round cake tin lined with non-stick baking paper. Bake for 25–30 minutes or until cooked when tested with a skewer ...
When the cake cooled, I gently unrolled the cake, making sure not to flatten it, before spreading the sponge with the lemon butter icing, leaving a 1cm border. I spooned the lemon curd evenly ...
And while any cake will do, the traditional ciambella is customary. It is simple and quick to make, and stays moist ... You can swap the lemon zest for orange or add vanilla extract or the seeds ...