Cut the pork up into 1-1½ inch pieces - If your conscience forces you, you can trim some of the fat off but in true Filipino style no fat should be trimmed.
Season and toss the cubes with the kosher salt.
Mix up the marinade and pour over the pork, submerging the pork as much as possible. Marinade overnight if you can, 4 hours minimum. Stir a time or two to make sure the pork is evenly seasoned.
After marinating, heat your wok or skillet on medium high and add the oil.
Blend 3 tsp coarse black pepper with the brown sugar and set aside.
Brown the pork in batches, removing each batch as it’s done. Don’t stir too much so that the cubes brown better. We’re shooting for crispy edges here.
When all of the pork is browned, remove to a bowl and add the onion to the oil with a pinch or two of salt. Stir around, and the released moisture from the onion will deglaze the wok. Cook for ~5 minutes on medium high, and then another 6-8 minutes on low to caramelize the onions.
Add the garlic at the end and stir until fragrant, then add the pork back to the wok and bring the heat back up to medium until the pork is heated through again.
Add the brown sugar and black pepper and cook to caramelize, a minute or two.
Add the ½ cup of soy sauce and the ½ cup of vinegar and cook for 2-3 minutes.
Add the cup of hot chicken bouillon and stir through.
Add the 4 bay leaves.
Bring to a boil and then reduce the heat to low, cover and simmer for 30 minutes.
Remove the lid, stir through, and then simmer uncovered another 30 minutes to concentrate the flavors.
Make your rice during the final cook.
Serve over the rice and garnish with sliced green onions.