Slice pork into thin rectangular cuts.
In a large bowl, mix in pork, cornstarch, fish sauce, egg and a dash of black pepper.
Marinate for at least 15 minutes.
Dredge pork in flour. Make sure it Is fully coated.
Heat pan and pour cooking oil for deep frying.
Deep fry coated pork for 5-6 minutes in medium heat.
Drain for excess oil, transfer to a plate and set aside.
In a large pan, drizzle in cooking oil for sautéing.
Sauté garlic.
Add in onions once garlic turns golden brown.
Once onions are translucent, add in green and red bell pepper and stir fry.
Pour in water, vinegar and sugar, then mix.
Once boiling, add in pineapple syrup and ketchup, continue mixing.
Add in Oyster sauce and mix well.
Season with a pinch of salt and a dash of black pepper.
Add in pineapple tidbits, bring to a boil while occasionally stirring.
Prepare a cornstarch mixture by mixing ½ tbsp. cornstarch with 1 tbsp. water.
Pour in cornstarch mixture then mix well.
Add in fried pork and mix it with the sauce.
Transfer to a plate then serve.