Slice the onion thinly, removing the core.

Season the pork with a pinch of salt and pepper.

Heat half of the salad oil (1/2 tbsp) in a frying pan over medium heat, pour in the beaten eggs, and stir until semi-cooked. Remove from the pan.

Add the remaining salad oil (1/2 tbsp) to the pan, heat over medium, and stir-fry the pork until its color changes. Add the sliced onion and continue frying until softened.

Add the teriyaki sauce and stir briefly. Return the eggs to the pan and mix everything together.