It's amazing how many of my meals start on Twitter. Rarely, however, does a food suggestion from Twitter get delivered to my door. The other day, a friend mentioned that his favorite summer salad involved onions, ripe tomatoes, and purslane. I wrote back: "I've never even eaten purslane before. That sounds intriguing." A few days later, he showed up at our house with purslane and the ingredients for a simple salad. More