General Tso's Chicken

INGREDIENTS

• :
• ½ cup hoisin sauce
• ¼ cup white vinegar
• 3 tablespoons soy sauce
• 3 tablespoons sugar
• 2 tablespoons cornstarch
• 1½ cups water
• 4 boneless, skinless chicken breasts (about 1½ pounds), cut into 1-inch pieces
• 1 tablespoon vegetable oil
• 4 garlic cloves, minced
• 2 tablespoons grated fresh ginger
• ½ teaspoon crushed red pepper flakes
• 3 egg whites
• 1½ cups cornstarch
• ½ cup all-purpose flour
• ½ teaspoon baking soda
• 4 cups vegetable oil
• 1-2 green onions, thinly sliced (optional, garnish)