There was a special event at our grocery store where they butchered a whole, fresh tuna fish. I didn't know this event was happening, but fortunately stumbled upon it close to being complete. The customers were nuts fighting over the best cuts. The choicest pieces are the most fatty, but I prefer the leaner portions, so I was able to get a nice fillet. The head was the last piece to be sectioned off, and I saw one woman purchase both eye balls. I cooked it simply by searing with some crushed peppercorns. It was amazing!