1.Season The Tuna Steaks With Salt And Cayenne Pepper. 2.Melt The Butter With The Olive Oil In A Skillet Over Medium-High Heat. Cook The Peppercorns In The Mixture Until They Soften And Pop, About 5 Minutes. Gently Place The Seasoned Tuna In The Skillet And Cook To Desired Doneness, 1 1/2 Minutes Per Side For Rare.