Place the pork slices into a big wok or a large pot. Then add-in the diced onion and spring onion pieces on top.
Pour-in about 2/3 of the spicy marinade over the ingredients. Then add-in 3/4 cup of water. Place the wok on a medium-high heat and bring it up to a boil. (Use a soup ladle and spread the marinade around so it mixes evenly with the water. Also, use your chopsticks to split the pork pieces from each other so that way they don't fuse into one piece).
Once the stew is boiling, reduce the heat to a medium (don't forget!). Set a timer for 15 minutes.
After 15 minutes, you'll notice that 75%-80% of the broth has evaporated away. Add the rest of your spicy marinade in. (Note, you don't have to wait exactly until 15 minutes - if you see that 75% of the broth has evaporated, add-in the rest of the sauce then)
After you add the remaining 1/3 of the spicy marinade, let the mixture reduce for another 2 minutes. We want to reduce it until you see a very small layer of broth left in the pot (reference video).
After 2 minutes, turn the heat off. Finish by adding-in Sesame Oil (1 Tablespoon). Give it one final stir.
Plate the dish and garnish with a few shakes of Sesame Seeds. Serve with a bowl of hot rice. Say Bon Appetit and dig in!