Sprinkle London broil lightly on both sides with salt and pepper and place into a resealable plastic bag. Add soy sauce, honey, and oil; seal bag tightly. Massage meat on both sides with marinade. Marinate for one hour or overnight in the refrigerator.

Coat a grill pan with nonstick cooking spray; heat over medium-high.

Remove London broil from marinade; discard marinade. Grill meat for seven to eight minutes per side or until meat reaches desired doneness. (For medium, cook meat to an internal temperature of 145 degrees Fahrenheit.)

Place meat onto a cutting board; let rest for five minutes. Slice against the grain on the diagonal, into thin slices. Place onto serving platter. Sprinkle with toasted sesame seeds.