‘Chinese sauerkraut’, that’s how my Chinese aunt calls mustard greens. And she is right, it dóes taste a little like sauerkraut.
I can remember eating a kind of pita bread filled with sour greens and onion in China. One of my aunts cousins (or at least that’s what I think he was) took us on a day trip into the mountains while we where there. No idea where these mountains were, but it sure was beautiful! We drove the whole day and at one point we stopped at a river for a swim.