Step #1 Slice the chocolate lb cake & make jam sandwiches with the cherry jam, & layer the bottom of a large wide trifle bowl.
Step #2 Pour over the cherry brandy so that the cake soaks it up, & then top this with the drained cherries.
Step #3 Cover up with cling wrap & leave to macerate while you make the custard.
Step #4 Melt the chocolate on low to medium heat in the microwave, checking after 2 mins, though it will probably need 4 mins.
Step #5 Or you can place it in a bowl over a pan of simmering water.
Step #6 Once the chocolate is melted, ser aside while you get on with the custard.
Step #7 In a saucepan warm the milk & cream.
Step #8 Whisk the egg yolks, sugar, & cocoa In a large-ish bowl.
Step #9 Pour the warm milk & cream into the bowl whisking it into the yolks & sugar mixture.
Step #10 Stir in the melted chocolate, scraping the sides well with a rubber spatula to get all of it in, & pour the custard back into the rinsed saucepan.
Step #11 Cook over a medium heat until the custard thickens, stirring all the time.
Step #12 Make sure it doesn't boil, as it will split & curdle.
Step #13 Keep a sink full of cold water so that if you get scared you can plunge the bottom of the custard pan into the cold water & whisk like mad, which will avert possible crisis.
Step #14 The custard will get darker as it cooks & the flecks of chocolate will melt once the custard has thickened.
Step #15 And you do need this thick, so don't panic so much that you stop cooking while it is still runny.
Step #16 Admittedly, it continues to thicken as it cools & also when it's chilling in the refrigerator.
Step #17 Once it is ready, pour this into a bowl to cool & cover the top of the custard with cling wrap to prevent a skin from forming.
Step #18 When the custard is cold, pour & spread it over the chocolate cake layer in the trifle bowl, & leave in the refrigerator to set, covered in cling wrap overnight.
Step #19 When you are ready to decorate, softly whip the cream for the topping & spread it carefully over the layer of custard.