Mince the onion and microwave it in a heatproof container covered with plastic wrap for 1 minute and 30 seconds at 600W. Let it cool.

Mix all the meat mixture ingredients in a bowl until sticky and form into oval patties.

Heat salad oil in a frying pan over medium heat. Add the patties and cook until browned. Flip them, cover with a lid, and cook on low heat for 5 minutes until fully cooked.

Add the teriyaki sauce ingredients to the pan.