Basically a carbonara with extra steps - fry your guanciale cubes, set aside. Reserve the fat from the guanciale. Then, fry the meat from a fennel salsiccia, add a bit of passata. Mix cooled down guanciale fat with pecorino and egg yolks in a bain marie to create a creamy sauce. Precook pasta for half the time it takes to fully cook it. Add pasta and a little pasta water to pan, finish cooking pasta until all dente. Combine with sauce, fried guanciale and serve with parmeggiano cheese and fresh black pepper.