Cut the pork into bite-sized pieces.
Thinly slice the onion and green onion.
In a bowl, mix soy sauce, sugar, minced garlic, and sesame oil to make the marinade.
Add the sliced meat and vegetables to the marinade and let them sit for 20 minutes.
Heat some oil in a pan over medium heat and stir-fry the marinated ingredients.
Once the meat is cooked, finish with a sprinkle of sesame seeds.