Thinly slice your pork belly; either keep the skins or remove them.
Prepare the aromatics —ginger, garlic, and scallions. Lay the scallion flat on your cutting board. Using the flat side of your knife blade, gently smash/press down. This helps break down the layers slightly. After that, cut the scallion diagonally into segments about 2 inches long.
Sear the pork belly: add a tiny amount of oil to the wok and cook until well seared. This may take some time, but it is the key step for a well-flavored scallion and pork belly stir-fry. I will recommend frying them until deep-golden brown.
Move the pork belly to the sides of the wok, add garlic and ginger, and fry until aromatic.
Place 2/3 of the large scallion sections in, then add light soy sauce, salt, and sugar. Quickly stir-fry for around 10 seconds until the large scallions are just cooked.
Then add the remaining 1/3. Mix for another 5 seconds. Transfer out and serve hot.