I second the garlic recommendation here. It is more tolerant to nutrient and water variability than most crops. Slugs and many other pests won’t bother it.

If you do give it regular fertilizer and water then you can plant it extremely densely, seeding just a few inches apart. Great for apartment dwellers with raised bed or container gardens.

We plant around Halloween and harvest in early July. That leaves time and space for a late summer crop if you wish.

Also, garlic stores very well. We harvest about 100 bulbs each year from a small plot, maybe 2-3 sq m., and that gives us garlic for a year, fresh, cured, minced (into butter or pesto), and for gifts.

And don’t even get me started on how amazing and versatile garlic scapes are. The scape harvest is its own prized crop!

Added: I’m in Vancouver. Garlic seems to love the overwintering process here, usually with some light snow.