Break the cake into chunks and add one chunk at a time to your food processor, blitzing each batch for about 10 seconds
If the cake you are using is crumbly, add enough brandy (or melted chocolate works well) to bring the mixture together
Use a small cookie scoop to scoop out mounds of the mixture, placing them on a lined tray. Place tray in the freezer for 10 minutes, to help the mixture stiffen (this is necessary when using my 4 ingredient Christmas cake, as it's very moist)
While the mixture is in the freezer, heat your dark chocolate. In a microwave safe bowl, heat the chocolate for 1 minute, then stir briskly. Repeat in 20 second blasts, stirring briskly in between. Be careful to only heat the chocolate until it has just incorporated after stirring.
Take the tray from the freezer and, wearing food handling gloves (the mixture gets sticky!) roll each mound of mixture into a ball
Dip each ball into the melted chocolate, then remove using a fork, giving it a light shake and tap to remove excess chocolate. Place on a lined tray and continue with the rest of the balls.
Once all of the balls are coated, melt the white chocolate melts in a small cup, then transfer to a small snaplock back. Snip a small corner of the bag and drizzle the white chocolate over the truffles to create a Christmas pudding. Only drizzle about 3-5 puddings, then decorate them, as the white chocolate will set quickly.
Once all puddings are decorated, they can be stored in the fridge in an airtight container for about 3-4 weeks, or in the freezer for 3 months