12-16slices, depending on how greedy you are
By Keith Floyd
Cream together the butter or margarine with the lemon zest and caster sugar until the mixture is really light and fluffy. You can employ your hand-mixer to do the job instead, if you prefer. Sift together the flour and salt. Beat the eggs into the creamed mixture gradually, adding a little flour as you go along to prevent the mixture from curdling.
Fold in the rest of the flour with a m