Pat the top 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 heavy skillet over medium-high heat until very hot
Add a small amount of oil with a high smoke point
Place the steak in the skillet
Cook without moving it for 3 to 5 minutes
Flip the steak
Cook the other side for 3 to 5 minutes
Sear the edges briefly with tongs
Check doneness with a meat thermometer
Remove the steak at 125°F for rare
Remove the steak at 130°F for medium-rare
Remove the steak at 140°F for medium
Remove the steak at 150°F for medium-well
Transfer the steak to a plate
Let it rest for 5 to 10 minutes
Slice against the grain
Serve immediately