This is mouloukhieh; a very popular green in Lebanon and Egypt (where it originated). Mouloukhieh is also known as corchorus olitorius, jew’s mallow, corette (in French) and Asian names (popular as a tea in Japan), or country-style American names like bush okra.
It is easy to grow from seeds, my friend Phoebe used to grow it in her backyard in Dallas, Texas. It takes only a few weeks to grow. It also freezes beautifully; in fact, every Middle-Eastern store sells it frozen and dried.
In Lebanon, it is prepared as a stew or a soup to which chicken or lamb is added and served over rice with a bowl of chopped onion swimming in vinegar or lemon juice and another bowl of baked pita croutons.
I have posted two methods of preparing it, however there are many more. In terms of nutrition, it is an extremely nutritious green (calcium, iron, fiber, antioxidants, etc).
To prepare it Lebanese-style
To prepare it Coptic-style