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Tip the cream and milk into a saucepan, then bring to the boil. Beat the yolks and malt powder together in a bowl, pour over the hot cream, then continue beating until everything is combined. Tip the mixture back into the pan, then cook on a low heat for 3-4 mins, stirring continuously until the consistency of thin custard. Remove from the heat. Stir in the chocolate until melted, stir in the Irish cream liqueur, then chill.
Once the custard has cooled, churn it in an ice-cream machine until frozen. If you don’t have a machine, place the custard in a bowl in the freezer. Freeze until the sides become icy, then beat with a whisk. Repeat the process 3 more times until you have smooth ice cream. Ice cream can now be frozen for up to 2 weeks. Serve in scoops with chocolate coated malt balls crumbled over, if you like.