It's time to spill the beans … on cooking beans. Martha Stewart is learning from the very best, as legume professional Cesare Casella shares all there is to understand. He's concentrating on three different cooking methods– stovetop, pressure cooker, and oven– so whether you are making bean salad, panzanella, or baked beans, you will be prepared with the right bean for the task. From the fundamentals of preparation (dried vs fresh, soaking, bean water, and even how…