Sweet and Sour Chicken

Name: Sweet and Sour Chicken
Ingredients: 1 pound boneless, skinless chicken thighs or breasts, cut into 1-inch chunks; 1 large egg white; 1 teaspoon kosher salt or 1/2 teaspoon table salt, divided; 2 teaspoons cornstarch; 1 ( 10- ounce ) can pineapple chunks , drained, juice reserved; 1/4 cup juice from the canned pineapple; 1/4 cup white vinegar; 1/4 cup ketchup; 2 to 3 tablespoons brown sugar; 4 teaspoons cooking oil; 1 red bell pepper, cut into 1-inch chunks; 1 yellow bell pepper , cut into 1-inch chunks; 1 teaspoon grated fresh ginger