Recently, while buying greens at the farmers' market, I was encouraged to try purslane, which was entirely new to me. The vendor tossed some in with the spinach and mesclun in the bag. As part of a salad, it was an interesting element. The taste was slightly lemony and astringent, though not at all bitter. Then a friend mentioned that Dr. Oz has been touting the health benefits of purslane, and I saw folks talking about it on Twitter, so I did a little research about it. Purslane is high in omega-3 fatty acids, has more beta-carotene than spinach, and also is rich in magnesium and potassium. It grows wild, and many consider it a weed. Purslane is a succulent plant, a member of the portulaca family. It resembles a small jade plant, with reddish stems and sturdy oblong leaves. If you can't find it at your farmers' market, it's fairly easy to grow from seed. With a flavor similar to that of arugula or watercress, purslane is a delicious and healthful addition to potato salad. Here's a simple recipe to try.