Pork and Potatoes in Tomato Sauce

Overview

I had some time at home yesterday afternoon, so I tried to make this dish because my son likes potatoes.

Cut potatoes into hob pieces.
Cut the pork into large pieces, fluff it with the back of a knife, add salt, oyster sauce, an appropriate amount of oil and egg white to marinate.
Fry the potatoes in a non-stick pan over low heat. Use low heat. It takes a lot of time.
Use a non-stick pan to fry the potatoes. After frying the pork in the same way, add an appropriate amount of tomato sauce and a spoonful of sugar. Season and stir-fry the pork and potatoes together. I fried the egg yolk and put it on top.