1 - Preheat the oven to 180°C/fan 160°C/gas mark 4 and grease and line a 25cm x 20cm tin.

2 - Melt the butter, sugar, syrup and orange zest in a large saucepan over a medium heat.

3 - The aim is to dissolve all the ingredients so that they are smooth, but to not lose any volume through boiling so be careful not to overheat.

4 - Add the oats and stir well until evenly coated.

5 - Stir through the leftover Christmas pudding and tip into the prepared tin.