Pat tuna steaks dry and season on both sides with salt and cayenne pepper.
Melt butter in a skillet over medium-high heat.
Add olive oil and pepper corns; cook until peppercorns soften and pop, about 5 minutes.
Gently place seasoned tuna in the skillet and cook to desired doneness, anywhere from 30 seconds to 1 1/2 minutes per side.
Slice tuna into 1/4-inch thick slices to serve.
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