Hand-rolled Macaroni with Crab and Grape Tomatoes

The Sardinian word busa comes from bus, the Arabic name for a type of reed which grows in the Mediterranean and around which this pasta was originally rolled; it’s now the name given to the stick or narrow metal rod used to shape the pasta. In my dialect we call this pasta maccarrones a ferrittu – ferrittu means knitting needle, which is what we use to roll this pasta. However, it’s easier to roll on a square rod rather than a round one, which tends to slide rath