Place marinade ingredients in blender or food processor. Blend until smooth.
Place thinly sliced sirloin in a bowl. Pour marinade over sirloin. Make sure the meat is evenly coated with the marinade. Let sit for at least 1 hour up to a few hours.
Heat grill or skillet on medium high heat. Spray grill or skillet with cooking oil spray so that the surface is covered with a think layer of oil.
Once grill or skillet is heated, placed the sliced steak on it and spread it out making sure to not overlap. Once the bottom side it cooked, flip to cook the other side. These thin slices will cook very quickly!
Remove steak promptly once it is fully cooked.
To assemble wraps, thoroughly rinse the leaves of butter lettuce. Place a few slices of Korean BBQ beef on to the lettuce and garnish with green onions, sesame seeds, and kimchi.