There's a shepherd's pie, a chilli con carne, porridge, various soups and shakes, even chocolate snack bars -- and you have only the prescribed amount each day.
While it might be difficult to take tacos or burritos to work (without major spillage and sogginess), you can bring those delicious flavours in the form of chilli con carne.
Take out another third, and add smoked paprika, cayenne pepper and kidney beans and freeze for a chilli con carne and with the last third, serve with linguine.