Adding ricotta to lasagna is popular in the united states and it stems from southern italy. This tradition reaches its apex with the elaborate lasagne con la ricotta which is enjoyed often, especially during carnival time in naples. It is a distinctly different approach than the lasagna preferred in tuscany and other northern areas of the country. Immigrant families from southern italy brought ricotta lasagna with them when they arrived in the new world. This recipe is one of those italian-american variations. The recipe is unique in that a whole pork shoulder is used in making the tomato-based meat sauce. However, it is removed before assembling the lasagna and served as a second course. This means you get both a primo (pasta first course) and secondo (meat second course) out of one recipe