Pasta with Tuna Sauce

One of those wonderful from-the-pantry pasta dishes that can be prepared in the time it takes to boil the water and cook the pasta. Canned tuna is not only acceptable but necessary; but the ideal tuna here would be that taken from the tuna’s belly, the fattiest part, and cured (preferably by your Sicilian grandmother) in great olive oil. Assuming you don’t have that, buy tuna packed in olive oil from Italy or Spain. (In a serious specialty store, you might find belly tuna—probably labeled v