I saw a lot of cuttlefish in Venice, but it's hard to find in the USA. I finally found fresh cuttlefish at the Kam Man Asian market in Quincy.
Cuttefish are cephalopod mollusks like squid and octopus. For cooking they are most like squid.
This is a very traditional recipe from Veneto, the region of northeast Italy that includes Venice. You clean and cut up the cuttlefish meat, saute it briefly in seasoned oil, and simmer gently in tomato sauce until tender. It can also be made with little cuttlefish that must be cleaned and the beaks and ink sacs removed, but they can be otherwise cooked and eaten whole.