Tip MAKE AHEAD

The sponge can be made up to two days ahead. Once baked, leave to cool and store in an airtight container. Cover individual portions with a plate or microwave-safe lid and reheat in the microwave for 20-30 seconds. Or, reheat the entire cake in the oven. Splash a few drops of water over the surface and wrap in foil. Bake at 180C/160C fan/ gas 4 for 15 mins until hot and steamy. The custard can also be made up to two days ahead. Chill in the fridge and reheat in a pan over a low heat, stirring until piping hot.