Personally, I prefer my octopus cooked. A nice recipe is Octopus Salad. Just boil the octopus in a small quantity of water for about 20 minutes. You don't need much water because, as a local saying in dialect goes, "u pulp s cosc ind all'accq so stess" or "the octupus cooks in its own water."
Once it's cooked, just chop the whole thing up into bite-sized pieces and mix with olive oil and chopped parsley...and buon appetito!