Sweet and Sour Pork

Name: Sweet and Sour Pork
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: Chinese
Ingredients: 1 pound pork butt, cut into 1 inch cubes; 1 teaspoon soy sauce; 1 teaspoon salt; 0.25 teaspoon white sugar; 1 egg white; 2 green onions, chopped; 1 quart vegetable oil for frying; 0.5 cup cornstarch; 1 tablespoon vegetable oil; 3 stalks celery, cut into 1/2 inch pieces; 1 medium green bell pepper, cut into 1 inch pieces; 1 medium onion, cut into wedges; 1 pinch white sugar, or to taste; salt to taste; 1.25 cups water, divided; 0.75 cup white sugar; 0.33333334326744 cup apple cider vinegar; 0.25 cup ketchup; 0.5 teaspoon soy sauce; 0.25 teaspoon salt; 1 (8 ounce) can pineapple chunks, undrained; 2 tablespoons cornstarch