Cut the pork into bite-sized pieces.
Season the pork with soy sauce, cooking wine, and pepper.
Mix potato starch and eggs to make the batter.
Coat the pork pieces in the batter.
Heat enough cooking oil in a pan and fry the pork until crispy.
Drain the excess oil from the pork and set aside.
In a pan, make the sauce with vinegar, sugar, ketchup, and soy sauce.
Toss the fried pork in the sauce to finish.