Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   4                    fresh         boneless tuna steaks
                        -- 6 to 8 oz. each
                        salt and freshly ground
                        -- black pepper
     1/4  cup           sherry vinaigrette

Preparation:

Rinse the steaks and pat them dry. Place them in a glass pan, season with salt and pepper and pour vinaigrette over them. Cover with plastic wrap and marinate for 30 minutes to 1 hour. Preheat the grill. Grill the steak for 2-3 minutes per side for rare, 5 minutes per side for well done. Source The Grilling Season by Diane Mott Davidson