To approximate the flavor of naranja agria, the sour oranges used in the Yucatan, Romero adds lemon and lime juices to the soup.
Chipotle peppers are large jalapenos that have been dried and smoked.
They add smokiness and heat to the soup, while jalapenos only add heat. In a large saucepan heat oil over medium heat. Drain on paper towels. Add the carrot, celery, broth, chicken, and the orange, lime, and lemon juices, and bring to a boil. Reduce the heat, cover, and simmer 20 minutes or until the vegetables are tender.