If you're making one for Father Christmas though, you may as well mix one up for yourself as well, and while you could make a similar drink with the mince pie brandy, this recipe with a mince pie syrup is a simple alternative.
Add the mince pie syrup, three dashes of bitters and a barspoon of water to a mixing glass. Stir to combine. Add a handful of cubed ice and 30ml whisky and stir well. Add a second handful of ice and the remaining whisky and stir again. Strain into a chilled old fashioned glass over fresh ice.
Mince Pie Syrup - Warm 500ml water and 500g sugar in a pan over a low heat, stirring until the sugar has dissolved. Add 200g mincemeat, bring to the boil and then turn off the heat. Allow the mixture to cool and then strain into a sterile bottle. Keep (in the fridge) for two weeks.