Divorce? Death in the family? Nothing that a little meat loaf and mashed potatoes can't fix. Because we turn to comfort food during difficult times, it had better be nice food. No hard edges, nothing challenging, no effort involved. Nonni's Sunday Chicken, which is always on the menu at Rancho Pinot Grill, is a hearty, soul-satisfying bowl of love. To describe it as wine-braised chicken and vegetables served over crunchy polenta cakes doesn't capture the most comforting aspect of this dish: its texture. This chicken asks nothing of you -- it just helpfully falls off the bone, as though it knows you've had a hard day. Or perhaps it senses that you shouldn't be trusted with a knife.