1 large lemon, finely grated zest only
gel food colouring, in red and green
225g/8oz caster sugar
70驳/2陆辞锄 ground almonds
200g/7oz natural marzipan
225g/8oz self-raising flour
400g/14oz plain chocolate, broken into small pieces
225g/8oz softened butter
300ml/10fl oz double cream
4 large free-range eggs