There lots of types of tuna, personally I only eat yellowfin also known as Ahi. I like it dipped in a sauce that I make, coated with sesame seeds and seared in a very hot skillet for a minute or two. When done it appears to be raw but served with pickled ginger, some of my sauce and wasabi, there is nothing better. Growing up I fished a lot and always ate fish well done. There is a long story behind my conversion, but I won't bore you with it here.