As a teenager I was a member of the Girl Guide Association and was lucky enough to go on the annual camp.
Our guiders called the supper eaten on the last night of camp ‘Roman Remains’.
This was essentially a meal of all the food remaining in the Kitchen tent – not left overs, just things that had not been used. We had some pretty interesting concoctions – I don’t know where the term came from but it is one that has stuck, and is used in our house for any meal made from the items left in the cupboard / fridge at the end of the week / holiday.