In a hot pan, add the sesame oil, garlic, green onions and ginger. When it is fragrant, add the skin and fat from the pork belly.
Once the pork belly fat is brown, add stock and simmer until soft, about 15 minutes. Meanwhile, prepare the noodles.
Add the soya sauce and then the pork slices. Boil briefly, it should not take more than a minute if you have sliced the pork thin enough. Top with scallions and some chilli oil.
Dipping sauce is ready!