Shanghai Fried Noodles

Name: Shanghai Fried Noodles
Ingredients: 10 ounces pork shoulder or pork tenderloin; 2 tablespoons avocado oil; ½ onion (sliced); 2 cloves garlic (minced); 6 fresh shiitake mushrooms (sliced); ½ small napa cabbage or regular cabbage (about 2-3 cups); 1½ pound precooked Shanghai noodles or udon; 2 stalks green onion (cut into 2 inch pieces); 1 teaspoon sesame oil; 2 teaspoons soy sauce; 1 teaspoon sugar; 1 teaspoon cornstarch; ⅛ teaspoon ground white pepper; 2 tablespoons soy sauce; 2 tablespoons oyster sauce; 1 tablespoon dark soy sauce sauce; 1 teaspoon better than chicken bouillon; 2 teaspoons sugar; ¼ teaspoon ground white pepper