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Beat together the mascarpone, custard and icing sugar, then set aside. Arrange 6 of the sponge fingers in the base of a trifle dish in a single layer, and drizzle with 1 tbsp of the rum, if using. Drizzle with a quarter of the caramel sauce and top with a quarter of the banana slices, then spoon over a third of the custard mixture.
Repeat the layers until all the ingredients have been used up, finishing with sliced bananas and grated chocolate. The trifle can be served straightaway, but it’s best served chilled for 1-2 hrs or up to 24 hrs – this allows the sponge fingers time to soak up the custard and soften.