Polenta Express:Polenta is an excellent base for all kinds of dishes, and nothing could be faster than quick-cook polenta – except perhaps quick-cook couscous!I cooked up a batch this morning, which I purchased in an Italian deli, and left it to chill in the refrigerator, pressed into a loaf-shaped pan. Around dinner time, it slices nicely into rectangular crostini, which I toasted, crispy in a