Season the tuna steaks with salt and cayenne pepper.
Melt the butter with the olive oil in a skillet above medium-large heat. Cook the peppercorns in the mixture until they soften and pop, about five minutes. Gently location the seasoned tuna in the skillet and cook to wanted doneness, 1 one/2 minutes per side for uncommon.
See how to make swift, straightforward, sophisticated seared tuna steaks.