Pat the tuna steak dry with paper towels
Season both sides with salt and black pepper
Optional: rub with olive oil, garlic, lemon juice, or soy sauce
Heat a skillet or grill over high heat
Add a small amount of oil to the pan
Place the tuna steak in the hot pan
Sear for 1 to 2 minutes per side for rare to medium-rare
Cook longer if you want it more done
Remove from heat
Let it rest for 1 to 2 minutes
Slice against the grain
Serve immediately