Potatoes are great. Low maintenance crop but it does require a lot of water. Sunchokes are a good option as well, for an Autumn harvest; keeps well in the ground. Down side is the winds.

I’d recommend getting some broad leaf vegetables seeds, like cabbage. My country has a variety that can be harvested leaf by leaf and just keeps growing and producing seeds, year after year. Some turnips, too. And some tomatoes and chillies. And beans.