Apparently Boxing Day was a day when servants and tradespeople were rewarded with boxed gifts that included food, often the Christmas leftovers. Where are the servants when you need them?
I think it is generally understood that Boxing Day is a day for eating leftovers and quick ring around will usually find willing diners. It is much easier to invite some people over to help out than to 'box up' the leftovers.
The potatoes reheated in a pan with some rosemary and garlic until crispy and fragrant. Fresh bruised rosemary and some salt flakes to garnish.
All that was needed for a simple and delicious dinner was a selection of mustards, pickles, chutneys, relishes and some crusty bread.
Leftover pudding with brandy cream for those who could face it or fresh berries for those with more regard for their waistlines. Coffee and chocolates/cake/shortbread for those so inclined.