Preheat your oven to 300°F.
In a small bowl, mix together the salt, black pepper, garlic powder, and onion powder. Rub this spice mixture all over the pork ribs.
Place the ribs on a baking sheet lined with aluminum foil, meat side up. Cover the ribs tightly with another piece of foil. Bake in the preheated oven for 2.5 to 3 hours, until the meat is tender.
While the ribs are baking, prepare the glaze. In a medium saucepan over medium heat, combine gochujang, honey, soy sauce, rice vinegar, sesame oil, grated ginger, and minced garlic. Stir until well combined and bring to a simmer. Reduce heat and let it simmer for about 10 minutes until slightly thickened.
Once the ribs are done baking, remove them from the oven and discard the top layer of foil. Brush a generous amount of the gochujang glaze over the ribs.
Increase the oven temperature to 400°F. Return the ribs to the oven, uncovered, and bake for an additional 15-20 minutes, basting with more glaze halfway through, until caramelized and bubbly.
Remove the ribs from the oven and let them rest for 10 minutes. Slice between the bones and serve garnished with sesame seeds and sliced green onions.