200g real dark chocolate, finely chopped
150ml boiling water
4tbsp Morello cherry jam
one packet trifle sponges (eight pieces)
two jars of pears in their juice (about 400g pears, 400ml juice)
one good slug of eau-de-vie de poire Williams or vodka
500ml ready-made custard
250ml whipping cream
250ml plain full-fat thick-set yoghurt
chocolate curls, leaves or flakes and unsweetened cocoa powder to decorate.