Combine pork loin, 2 tablespoons soy sauce, 2 tablespoons sesame oil, five spice, and black pepper in a bowl. Leave to marinate for 5-10 minutes.
Heat remaining sesame oil in a wok.
Sautee cabbage and carrots briefly. Season with salt and set aside.
Heat peanut oil in the same wok.
Add the pork and sautee for a minute.
Add garlic and onions. Sautee until aromatic.
Add chicken stock, remaining soy sauce, and black bean paste. Bring to a simmer.
Add vermicelli and simmer over low heat until all the liquid is absorbed by the noodles. Add more stock if needed.
Toss the cabbage and carrots back into the wok.