Preheat the oven
to 160C/325F/Gas 3. Grease a deep 20cm/8in round
cake tin, line with a double thickness of
greaseproof paper and grease the paper.
Beat together the
butter and sugar until light and fluffy. Gradually
beat in the eggs. Stir in the dried fruit, glace
cherries and sherry, if using. Sift over the flour,
mixed spice and baking powder, then fold in.
Roll out half the marzipan to a
20cm/8in round. Spoon half of the cake mixture into
the cake tin and place the round of marzipan on top.
Add the other half of the cake mixture and smooth
the surface.
Bake for 2 1/2h hours, or until
golden and springy to the touch. Leave in the tin
for 15 minutes, then turn out on to a wire rack,
peel off the lining paper and leave to cool.
Roll out the reserved marzipan
to fit the cake. Brush the cake top with egg yolk
and place the marzipan on top. Flute the edges and
make a pattern on top with a fork. Brush with more
egg yolk. Put the cake on a baking sheet and grill
for 5 minutes to brown the top lightly. Cool before
decorating.