Chinese Sweet and Sour Pork

Name: Chinese Sweet and Sour Pork
Cuisine: Asian, Chinese
Ingredients: 400g pork tenderloin or shoulder, cut into 1-inch cubes; 1 egg, beaten; 1/4 cup corn starch; 1/4 cup all-purpose flour; 1/2 red bell pepper, cut into chunks; 1/2 green bell pepper, cut into chunks; 1 small onion, cut into chunks; 1/2 cup pineapple chunks (fresh or canned); Vegetable oil (for deep-frying); 1 tbsp light soy sauce; 1 tbsp Shaoxing wine (or dry sherry); 1/2 tsp salt; 1/4 tsp white pepper; 3 tbsp ketchup; 2 tbsp rice vinegar; 2 tbsp sugar; 1 tbsp light soy sauce; 1/4 cup pineapple juice (from the can, or water if using fresh); 1 tsp corn starch, mixed with 2 tbsp water (to thicken the sauce)