I've been eating my way through everything left in our fridge and cupboard over the course of about a week, since we're going away over the Yule season, and also because I don't want to spend any more money unless I have to. For lunch just now I had left-over brown rice (from last night's dinner), baked beans with the last bits of vegan cheese and some sage. (Sage goes really well with baked beans ... IMO.) And I made a quick and simple salad from the last bits of lettuce, a yellow bell pepper and a carrot + rapeseed oil. Also squirted lemon juice on everything since we have a bag of lemons which will probably go bad unless I can find some use for them.
Simple and cheap, yet relatively healthy food, I think.