Pat the ahi tuna steak dry with paper towels
Season both sides with salt and black pepper
Optional: add garlic powder, sesame seeds, or a light soy sauce marinade
Heat a skillet or grill pan over high heat until very hot
Add a small amount of oil with a high smoke point
Sear the tuna steak for 30 to 60 seconds per side for rare
Sear for 1 to 2 minutes per side for medium-rare
Avoid overcooking
Remove from heat and let rest for 1 to 2 minutes
Slice against the grain
Serve immediately