So I’ve been on something of a greens kick lately - specifically watercress - as I'd been wanting to explore what exactly is so great about these dark leafy greens.  And then there it was - freshly stocked in the produce aisle, beckoning, as if to remind me of all the wondrous things I have read about it...  Not just a superfood, but perhaps the king of all superfoods... rich in chlorophyll, antioxidants, and on and on.  Heeding this suddenly health-conscious voice in my head, I dutifully grabbed a bag of these magical leaves to see if they can possibly live up to all of the superfood hype. Greens &…