Make the sauce. In a small mixing bowl, whisk together chicken broth, soy sauce, garlic, and cornstarch; whisk until well combined and set aside.
Warm the cooking oil. Heat vegetable oil in a wok or a large 14-inch frying pan set over high heat.
Cook the pork. To the hot wok, add pork pieces and stir fry for about 4 to 5 minutes or until browned on all sides and cooked through. Remove the pork from the wok and set aside.
Cook the vegetables. To the wok or skillet, add celery, onions, pepper strips, and mushrooms; cook over high heat for 4 to 5 minutes, or until softened.
Add the sauce. Give the prepared sauce a quick stir, and then add it to the wok and cook for 1 minute or until thickened.
Combine. Add the pork and pork juices back into the wok and cook for 20 seconds or until heated through.
Serve. Remove from heat. Garnish your pork chop suey with green onions and serve.