Mix the chicken shreds with a pinch of the salt, the egg white and about 1 teaspoon cornflour/cornstarch paste. Blanch them in warm oil, stir to separate, then remove and drain them. Pour off the excess oil, leaving about 2 tablespoons in the wok, stir-fry all the vegetables for about 1 minute, add the remaining salt and sugar, blend well, then add the chicken with the soy sauce and wine, stir-fry for another minute, and add the stock and MSG, if using; finally thicken the gravy with the remaining cornflour paste, garnish with the sesame oil and serve hot.