1. 1. Marinate the chicken with soy sauce, ginger, and garlic for 30 minutes.

2. 2. Coat the chicken in cornstarch and fry until crispy.

3. 3. In a separate pan, sauté bell peppers, pineapple, and onions.

4. 4. Mix together ketchup, vinegar, sugar, and soy sauce for the sauce.

5. 5. Add the sauce to the vegetables and simmer until thickened.

6. 6. Toss the crispy chicken in the sauce and serve hot.