Season the pork pieces with salt and pepper. Mix with the cornstarch and mix until fully combined - the juices of the pork should get the cornstarch wet enough to use as base for coating with the cornflour afterwards. Coat all the pieces with the cornflour.
1 pound pork tenderloin, Salt and pepper, ¼ cup cornstarch, ½ cup corn flour, 2 cups vegetable oil
Heat the oil at 350°F (180ºC) (if you want to test the temperature, throw a piece of bread - it should float and start softly bubbling immediately). Start frying the pork in batches and transfer to a paper lined sheet as soon as each piece is golden on every side.
Heat a wok to medium-high. Add the vegetable oil, garlic and ginger. Cook for a couple of minutes.
2 garlic cloves, 2 tablespoons ginger, 2 tablespoons vegetable oil
Add the pineapple, peppers, and onions - sauté for a few minutes, until they start to get tender.
1 cup pineapple, ½ cup green bell pepper, ½ onion, ½ cup red bell pepper
Add the chicken and the sweet and sour sauce and toss to combine everything.
Sweet and sour sauce
Serve immediately over white rice with sesame seeds and green onions.
Sesame seeds