Pat the London broil dry
Score the surface lightly if desired
Season generously with salt, pepper, and any preferred spices or marinade
Marinate for several hours or overnight if using a marinade
Preheat grill, broiler, or skillet to high heat
Cook the meat over high heat until browned on both sides
Check for desired doneness with a meat thermometer
Remove from heat and rest for 10 to 15 minutes
Slice thinly against the grain
Serve immediately