When I think about throwing a dinner party, especially a big one like this polenta supper I'm sharing with you this week, my thoughts immediately go to: What can I make ahead? Last week, I had an easy answer: a shredded, succulent mess of beef braised in red wine and tomatoes, falling apart in its juices. It's a terrific make-ahead dish, since like most braises, this beef gets better overnight, and takes all the stress of a main dish off your hands entirely. Sound good? It gets better.