Peanut butter, the stuff our childhood lunches are made of, the world's most inexpensive protein. But in the hands of talented chefs and peanut butter fanatics, it's enjoying a culinary renaissance. Jeffrey Saad will try it gourmet style-with foie gras and tempura figs. He'll try it straight up in sandwiches with jelly, bananas, and (in homage to Elvis) bacon. He'll try it spiced and sauced in a few of the world's most exotic cuisines.