Pat the sirloin steak dry with paper towels
Season both sides generously with salt and black pepper
Let the steak sit at room temperature for 20 to 30 minutes
Heat a skillet or grill over high heat until very hot
Add a small amount of oil to the skillet if using a pan
Place the steak on the hot surface
Cook for 3 to 5 minutes on the first side
Flip the steak and cook for 3 to 5 minutes on the second side
Add butter, garlic, and herbs to the pan if desired
Spoon the melted butter over the steak while cooking
Check the internal temperature for desired doneness
Remove the steak from the heat
Let the steak rest for 5 to 10 minutes
Slice against the grain
Serve immediately