There are many versions of this cake with orange so lemon make a nice change. The recipe is easy to make and yields a fresh, moist cake with a lovely lemon flavour. It is very important that you use unwaxed lemons as you use all of the lemon, including the skin. I use erythritol from my health food shop as a subsitute to sugar. You can substitute this with another sugar substitute if you wish. This is such an easy cake to make but looks and tastes as if you have taken great care. Fool visitors with this one!