In my candied lemon peel and orange peel candy recipes, I coat the peels with granulated sugar after cooking them in sugar syrup. For these candied lemon slices, however, I leave them plain and that is because I like them that way. Plus, they look much prettier with all the shiny translucent centers and make excellent decoration for cakes and cupcakes. Having said that, if you prefer your candied lemon slices covered in granulated sugar, you can always do so. After removing the slices from the syrup and after letting them rest overnight, dip them into granulated sugar.