Depends where you are... I also have dendelion, and a lot of self-seeded leaves like chicorea, purslane, chards, lettuces, poppies and more.
But in my climate I can have malabar spinach (a must! I have the red stem variety), new zealand spinach, both great for summer!
And I have this tree, grrr cannot remember its name, never! they call it miracle tree, and the leaf is tasting like radish, because it is of brassicales, though a lot of peole think it is an acacia because of the form of the leave, great, I got it, the moringa!
But no way with freezing appart for having it annual or in a pot...
I also have chayamansa, a real perenial green as well, both are
trees... The chaya needs cooking.