If you want a fast, healthy, balanced meal for $4 or less, the obvious choice in America is a frozen meal (aka TV dinner).

You can microwave it in 4-6 minutes; ingredients are often flash-frozen, locking in nutrients; and food-safety concerns are addressed at scale, rather than in a hit-or-miss way in a tiny storefront.

So perhaps, instead of advocating for more tiny restaurants that would likely need to skimp on safety considerations, we should be advocating for more microwaves available in grocery and convenience stores, so people can select a frozen meal, heat it up, and be on their way.