I have a theory that there is a impossible trinity (like in economics), where a food cannot be delicious, cheap and healthy at the same time. At maximum 2 of the 3 can be achieved.
Is there any food that breaks this theory?
Edit: I was thinking more about dishes (or something you put in your mouth) than the raw substances
Some popular suggestions include
fruits (in season) and vegetables
lentils, beans, rice
mushrooms
chicken
just eat in moderation
Edit 2: Thanks for the various answers. Now there are a lot of (mostly bean-based) recipes for everyone to try out!
Also someone made a community for cheap healthy food after seeing this topic!
I have a feeling that the answer to this might be anything that you can grow from seeds. So, fresh fruits, vegetables, beans, grains, etc. then, like tomatoes or snow peas or apples or wheatberries. The thing is that these all take time to transform from seed to fruit, so if you include time in your constraint space these don't work. But you didn't so here you go :D