From www.italyum.com. "This recipe belongs to the culinary tradition of the city of Milan. It's a very old recipe, probably more than 400 years old and the story goes that while an artist was preparing the dye to colour the window glass of the cathedral (Il Duomo di Milano), his apprentice, by accident, poured some saffron powder into the near by pan of rice. Since then, the recipe has been elaborated many times, until nowadays. When cooking the proper "risotto alla Milanese" you require the use of some beef bone marrow at an early stage in the cooking."