Alium proliferum, commonly known as Egyptian Walking Onions. That is probably a racist name, because it's not referring to an Egyptian origin, but a habit. I think they're actually Welsh in origin.
Also known as Tree Onion, these perennial onions topset bulbils and then walk across the garden. The only thing that can even attempt to take them out is black aphids and overharvesting. Otherwise you will have plenty of onions year round FOREVER.
I have had scientists purchase the dried plant material from me to study the bioavailable compounds in this amazing plant.
If I had to quickly suggest one plant I'd recommend for a sustainable kitchen garden, this is top of the list.
You NEED these. They are amazing, easy, hardy, and add so much easy flavor and superfood-ish nutrition to your food. Imagine adding these to your rice and beans during a food insecure time. They make it appealing AND you won't get scurvy. 😆

Bulbils are sold by the ounce and will arrive packaged in a paper bag. They are not dried bulbs, so store them in the refrigerator if you do not plan to plant immediately.

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These Bulbils are not dried and should be used immediately or stored under refrigeration.

Plant ASAP. After established, these will provide many offshoots. Every part of this perennial onion can be eaten. For best results, establish this season and begin harvest next season. Ok to clip a few leaves off each plant, but do not begin pulling whole onions until your patch is established.