Heat 1 tablespoon of sesame oil in a large skillet or wok over medium-high heat. Add the diced onion, minced garlic, and grated ginger. Stir-fry for 2-3 minutes until the onions are translucent and fragrant.
Add the ground pork to the skillet and cook, breaking it apart with a spoon, until it is no longer pink, about 5-7 minutes.
Stir in the soy sauce and continue to cook for another 2-3 minutes, allowing the pork to absorb the flavors of the sauce.
Add the grated pear to the skillet and stir to combine with the pork mixture. Reduce the heat to low and let it simmer for 5 minutes to allow the flavors to meld.
Finally, add the chopped spring onion (scallion) to the skillet and stir to incorporate. Cook for an additional 1-2 minutes until the scallions are slightly softened.
Remove the skillet from the heat and transfer the Pork Bulgogi to a serving dish. Garnish with sesame seeds.
Serve hot with steamed rice and your favorite side dishes, such as kimchi or pickled vegetables.