Heat the cooking oil. Add the shredded pork. Season with a little patis. Cook over high heat until the meat is nicely browned and lightly crisp.
Add the onion, garlic, chilies and sugar. Cook for a minute, stirring often.
Add the kangkong. Season with more patis. Stir fry for two to three minutes.
Finally, add the fried tofu. Pour in the oyster sauce. Stir fry just until the tofu is heated through.
Serve the sweet and spicy kangkong with shredded pork and fried tofu at once.