Heat the oil in wok until the
oil surface ripples. Add the scallions
and ginger and stir-fry until
fragrant. Add the pork cubes.
Stir-fry until the pork turns
white. Stir in the soy sauce and
salt. Add the soy beans and stock.
Bring to a boil, skim off any
foam, and the MSG. Remove and
serve.