I use 1 inch thick London broil for this dish. Leave the steak at room temperature 1 hour prior to cooking for even cooking. The charcoal should be hot with small flames and lightly covered with ash. Without covering the lid, grill the steak for 10-12 minutes, 6 minutes on one side and 4 more minutes on the other side for medium rare. Add 2 more minutes on each side for well done. I like mine medium rare. Let the steak sit on a plate while you prep the vegetables and seasoning.
Peel and slice shallot thinly. Slice green onion and mint leaves.
Slice the steak into thin slices so that the beef is tender and absorbs seasoning well. Add lime juice, shallot, green onion, mint leaves, ground chili pepper, ground toasted rice and fish sauce to the steak. Mix well. Take a taste.