For the Chicken:
- 500g (1.1 lb) chicken thighs, cut into bite-sized pieces
- 1 egg white
- 3–4 tablespoons cornflour (cornstarch)
- 1 tablespoon soy sauce
- 1/4 teaspoon white pepper
- Pinch of salt
For the Sweet and Sour Sauce:
- 4 tablespoons sugar
- 3 tablespoons ketchup
- 3 tablespoons cider vinegar
- 1 tablespoon soy sauce
- 1 tablespoon cornflour (cornstarch) mixed with 2 tablespoons water
- 1/2 teaspoon ground ginger
- 1/2 teaspoon garlic powder
For the Stir-Fry:
- 1 medium red onion, cut into chunks
- 1 red bell pepper, cut into squares
- 1 green bell pepper, cut into squares
- 1 cup pineapple chunks
- Sunflower oil or vegetable oil for frying