Soak the noodles in water for 15 to 20 minutes. Drain well.
Heat the cooking oil in a frying pan.
Stir fry the carrot, green beans, cabbage and onion with a little fish sauce and black pepper for about a minute.
Add the garlic and stir fry for another 30 seconds.
Add the drained noodles. Season with a combination of soy sauce and fish sauce (too much soy sauce will make the dish too dark so combine with fish sauce to get a good color), and more black pepper.
Add the roast pork belly and stir dry until the noodles and pork are heated through.
Serve with kalamansi halves (or lime or lemon wedges) on the side.