Boil tripe for 1 hour, then remove and shred into strings. Boil again in 6 cups water (add baking soda) for about 1-½ hour until it becomes very soft. Remove and soak in cold water until light, drain dry.
Heat 3 tablespoons oil to stir-fry the tripe strings, add 1 tablespoon soy sauce, stir for only 10 seconds, remove quickly to drain.