Swiss Chard
Much like kale, chard is a a hardy, leafy green that is chock full of nutrients. Loaded will essentials like calcium, vitamin A, vitamin K, B vitamins, dietary fiber, potassium, and beta-carotene, Swiss chard comes in many varieties, but has a very similar flavor to beet greens (the two veggies are in the same botanical family).
Recipe: Garlicky Orecchiette with Swiss Chard and Fontina