NYT Cooking: This soup started life as quite a different thing. I'd made a traditional Persian chicken, cinnamon and Seville-orange stew and realized that it was the scented broth I loved the most. So I cut to the chase. A supermarket packet of chicken wings, a stick of cinnamon, a carrot, an onion, a knob of ginger and the juice and zest of an orange left to simmer on the%...