Slice pork to approx. 3mm thick slices
Marinate with ½ tsp salt, 2 tsp light soy sauce, 1 tsp sugar and 1 egg. Mix well together. Set aside
Cut onions, peppers and pineapple into wedges
Chop garlic and chilis
Prepare sauce by combining 3 tbsp ketchup, 2 tbsp vinegar, 1 ½ tbsp sugar, ½ tsp salt, 1 tsp cornstarch and 3 tbsp water. Mix well and set aside
Combine 4 tbsp of flour and 4 tbsp cornstarch. Mix well. Put onto a plate
Give the pork a mix and then use your hands to place it onto the plate with the flour and cornstarch, do not pour in the excess liquid from the marinade
Toss the pork in the flour mixture until the meat is separated and covered
In a non-stick pan, heat at medium-high heat and add 3 tbsp oil
Add pork into the fry-pan, one piece at a time so that each piece rests flat on the pan. Do not overcrowd the pan. Do separate batches if necessary
When one side of the pork has browned, flip over to the other side.
After browning both sides, remove from heat preferably on a cooling rack. Repeat until all the pork has been fried
In a wok or pan, heat on medium-high heat, add 2 tbsp of oil and add chopped garlic, chilis and onions. Stir-fry until onions are slightly softened
Add peppers. Stir-fry for 1 minute.
Stir-in the sauce and mix
Add the pork and mix
Add the pineapples and mix
Serve