Cook the noodles: Boil the Mama noodles just until they begin to loosen. Drain, rinse under cold water, and set aside. Discard the seasoning packets.
Prep the ingredients: Slice the pork belly and vegetables. Tear or thinly slice the kaffir lime leaves. Pound the garlic and chilies together with a mortar and pestle.
Cook the pork: Heat the oil in a wok over medium heat. Add the pork belly and stir-fry until lightly browned and the fat begins to render.
Add the aromatics: Stir in the pounded garlic and chilies. Cook until fragrant, about 30 seconds.
Season the stir-fry: Add the oyster sauce, fish sauce, dark soy sauce, and sugar. Stir well, then add the carrots, fresh black peppercorns, large chilies, and kaffir lime leaves. Cook for 1–2 minutes until the vegetables are just tender.
Finish the noodles: Add the cooked noodles and toss until evenly coated with the sauce. Stir in the holy basil and cook for 20–30 seconds, just until wilted. Serve immediately.