For the lemon cake, cream the butter, sugar and vanilla sugar with the whole eggs. Grate the zest from the two lemons and add the squeezed juice to the mixture.
Mix flour with baking powder and fold into the mixture. Pour the batter into a greased and floured pan (box or loin) and bake at medium heat for about 40 minutes.
For the glaze, mix the powdered sugar well with the lemon juice and glaze the cooled cake with it.
Let the glaze cool on the lemon cake.