Clean and prepare the soybean sprouts, green onion, and onion.
Add cooking oil to a pan, add the green onion, and stir-fry to make green onion oil.
Add sliced pork belly and stir-fry, then add the onion.
When the pork is cooked, add the soybean sprouts and sauce, and stir-fry over high heat.
Once the soybean sprouts are wilted, finish by drizzling sesame oil and sprinkling sesame seeds.