There are as many lasagna recipes as there are cooks in Italy, yet, with so much variation, there is one regional tradition that stands out among all the others: Bologna¡¯s lasagna. It is the lasagna that all others aspire (and fail) to be. This particular incarnation of Italy¡¯s famous recipe features sheets of spinach pasta layered with meat rag¨´ and b¨¦chamel.