Slice beef about 1 inch long 1/2 inch wide and as thin as possible. Mix the salt, sugar and soy sauce together and mix well, then ad the beef and marinate for at least one hour, longer for more flavor. Wash and slice the mushrooms, including stems. Slice the bamboo into thin strips; slice the scallions into 1 inch pieces; soak, rinse and drain the bean sprouts. In a seperate bowl, mix the cornstarch and beef stock together. Drain the beef reserving the marinade. Heat the seseme oil and stir fry the beef for 4 to 5 minutes. Ad the cornstarch mixture and remaining marinade, bring to a boil stirring constantly; ad the vegetables and simmer for 5 minutes longer. Cook noodles in boiling water for 4 to 5 minutes; drain thoroughly. Deep fry as needed draining on absorbent paper. Beat the egg adding 1 tablespoon water and pour onto lightly oiled skillet. Make a small thin omelet and slice into thin strips. Place cooked noodles on hot dish, top with beef mixture and garnish with the strips of omelet.