RCC, Swiss chard is one of my favorite greens. I like making Swiss chard and walnut lasagna.
Beets, there are so many different things that can be done with them! A good way to cook them is to toss with olive oil, salt, and pepper, put into a pan with a bit of water, cover with foil, and put into a 400 degree oven. Cook until tender and peel while still warm, since the skins just rub off.
Try grilling the turnips whole. Really tasty.
Pea tendrils are good with just a quick stir-fry, with some garlic.