Small scale food production is really cool. Some folks say that true creativity comes from having rigid limits, like the structure of a sonnet or villanelle. I've been thinking on small scale meat production, and I think you could do quite a cool job with just 3m² of balcony or porch space breeding rabbits, probably yielding around 20kg per year. Or potato buckets, which can yield something like 2kg of potatoes from a 20L bucket. You could fit something like 25-30 potato buckets in the same space. That's a bunch of potatoes.
Sorry if my math is a bit off, I'm working on my metric adaptations lol