

Frozen spinaches haven’t gotten a lot of attention in this thread yet!
Depends on how poor is poor and the cooking budget, but they stay good for a long time and you can add a bit to basically any dish: omelette, rice and beans, tomato pasta. Tasty, simple and flexible
Popcorns don’t need an air popper: a pot with a lid and some oil+salt.
Warning: you need to keep the pot at a high temperature for quite a while, so avoid using non-stick pans because they are going to die quickly.