Pajata
pagliata, rigatoni alla pajata, rigatoni con la pajata
Pagliata is a traditional Roman dish primarily using the intestine of a young calf (tripe). As it has only eaten milk, the resulting dish is similar to cheese in a sausage casing. It is usually plaited for serving.
Source: Wikipedia
Recipes

Rigatoni with pajata sauce - Zero Sei - Sotto Pinsa Romana
Let’s now talk about a classic food of Roman cuisine: the rigatoni with pajata sauce. This is a recipe of popular origins, traditionally prepared using calf meat, although it has been replaced by the lamb because of the prohibitions related to mad cow...

Ricetta Cucina romana: come preparare la pajata al forno - Donna Moderna
Cucina romana: come preparare la pajata al fornoLa pajata (in romanesco) o pagliata (in italiano) è un ingrediente utilizzato tipicamente nella tradizione culinaria popolare romana. Si tratta della prima parte dell’intestino tenue del vitellino da latte...