We're talking about collapse-of-civilization type scenario - you got land and nothing else. What do you plant?
Think of those categories as somewhat broad: zucchinis / pumpkins go with squash, broccoli / Brussels sprouts / kale go with cabbage, pears go with apples, etc.
I put the most popular
cereals on top, but I think they're pretty hard to grow / harvest alone.
This poll goes by what your primary source of carbs would be (calories from non-animal sources). For most people that comes from more energy-dense crops like grains and root vegetables. I'm not specifically listing lighter veggies like cucumbers or onions - they make excellent secondary choices, but you'd have to eat
a lot of them to get enough calories for an active lifestyle.
I'm thinking - potatoes FTW! Easy to grow in cold climates, easy to pick (without any tools / etc), relatively easy to cook, you never get tired of them, etc.