Add the zest of the 4 lemons.
Optional : add the juice of a lemon for extra flavour if desired.
Spoon into muffin cases and bake on oven temperature 200C/400F/gas mark 6 for 30-35 minutes until well risen and golden.
Mix together the icing sugar, juice from 1 lemon and juice from 1 orange.
Crush up the cinder toffee.
When the cakes are cool, spoon the icing mixture over the muffins.
Sprinkle the cinder toffee over the muffins.