Here tomato is not a player. Instead, sheer sheets of pasta are layered with a light chicken ragù and sprinklings of nuts, raisins, spices, and cheese, with a touch of cream--echoing the bewitching mix of savory and sweet you’d taste at Renaissance banquets. Believe it or not, many of Italy’s lasagnes today share this light hand. Serve this when you want to get away from the expected, yet have a dish that’s easily done in advance.