Combine the soy sauce with all the other ingredients up to and including the chilli flakes. Place the strips of beef in the marinade, cover and chill for approx. 1 hr.
In a bowl, mix the lime zest and juice with all the other ingredients up to and including the sesame seeds. Mix in the carrots, apple, herbs and chilli.
Rinse the rice in a sieve under cold running water until the water runs clear, then drain well. Bring the water, kaffir lime leaves and rice to the boil, turn off the heat and leave the rice to fluff up in the covered pan for approx. 15 mins.; do not remove the lid. Separate the rice with a fork.
Beef and mushrooms
Heat the oil in a frying pan. Fry the mushrooms for approx. 3 mins., remove from the pan. Remove the meat from the marinade, fry in the same pan for approx. 2 mins., turning occasionally. Remove, return the mushrooms and marinade to the pan, reduce for approx. 3 mins., add the meat and cook for approx. 1 min. Plate up the rice and carrot salad with the meat. Serve with the lime wedges.