Put cubed pork in a bowl, and season with 1 teaspoon salt, ¼ teaspoon sugar, and 1 teaspoon soy sauce. Mix in the green onions and egg white. Cover, and put in the refrigerator to marinate for at least 1 hour. When finished dust chicken with 1/2 cup of corn starch until evenly coated. Heat 1 quart of oil to 375 degrees in your deep fryer or wok. Fry pork in oil until evenly browned (should be about 10 minutes per batch).
Drain on paper towels.: Heat a tablespoon of oil in your wok over medium heat. Stir fry celery, onions, and green peppers cook until tender. Season with sugar and salt – remove from pan and set aside.
To make the sweet and sour sauce- In your wok (or saucepan) mix 1 cup of water, ¼ teaspoon salt, ¾ cup sugar, 1/3 cup apple cider vinegar, ¼ cup ketchup, and ½ teaspoon soy sauce. Bring to a boil, and stir pineapple chunks with juice. Return to a boil and mix 2 tablespoons of cornstarch in a cup of water to thicken the sauce.
Cook until thick and well blended. In a bowl pour the e over fried pork, and add vegetables and mix well.