This Tuna has very little fat- it is best prepared rare. I would strongly caution against grilling because its very difficult [not impossible] to achieve the precise targeted doneness. My recommendation is to pan sear but even this has to be done with focus. Get your pan VERY HOT add a little neutral oil [ex. canola] – season both sides of Tuna with a little salt and pepper- lower no more than 2 pieces of Tuna at a time into the pan- 45 seconds on each side- THAT’S IT! When taking out of pan place SPACED OUT on serving plate. If the Tuna is to close to each other they will continue to cook each other beyond normal carry over cooking. I suggest slicing the Tuna and fanning out on the dinner plate to show off the nice rare center. Any sauce should be drizzled around the Tuna as to not cover the beauty of the Tuna itself.