Mal, make a mixture of three peppers - black, white & red. Sprinkle this and salt to taste on a chilled hunk of tuna. Preheat an iron skillet on medium high heat. Using a high smoke point oil or softened duck/goose fat, sear the tuna on all sides. This should happen quickly, a few seconds each side. Your objective is a rare heart to the piece of tuna flesh with a seared, seasoned "rind." You may slice and serve immediately for the warm exterior/cool interior experience, or cool, wrap, and chill to serve cold, later.