For restaurant-quality pasta at home, learning to use pasta cooking liquid to finish the sauce is essential—the dissolved starch in the water thickens the sauce while suspending the fat in a cream emulsion that clings to the noodles. For the best result, we love artisanal pastas like Pastaio Via Corta, Rustichella d’Abruzzo, Martelli, and Seggiano Organic. Each of these companies extrudes their pastas through bronze dies and makes their doughs from 100 percent durum semolina wheat, creating a rougher texture that helps the sauce cling to the noodle. Using store-bought chicken liver mousse makes this recipe quick without sacrificing flavor.