→ For the Sauce
                    
                      
                        01 - 
                        3 tablespoons cane or white vinegar (can substitute rice or apple cider vinegar)
                      
                    
                      
                        02 - 
                        1/4 cup ketchup
                      
                    
                      
                        03 - 
                        1/4 cup sugar
                      
                    
                      
                        04 - 
                        1/2 cup water
                      
                    
                      
                        05 - 
                        1/4 teaspoon red pepper flakes (optional)
                      
                    
                      
                        06 - 
                        1 tablespoon soy sauce
                      
                    
                      
                        07 - 
                        2 teaspoons cornstarch
                      
                    
                  
                    → For the Chicken
                    
                      
                        08 - 
                        12 ounces boneless, skinless chicken thighs or breasts, cut into 1-inch pieces
                      
                    
                      
                        09 - 
                        1 egg white, lightly beaten
                      
                    
                      
                        10 - 
                        1/4 cup all-purpose flour
                      
                    
                      
                        11 - 
                        1/4 cup cornstarch
                      
                    
                      
                        12 - 
                        1 teaspoon baking powder
                      
                    
                      
                        13 - 
                        Salt and pepper to taste
                      
                    
                  
                    → For the Stir-Fry
                    
                      
                        14 - 
                        1 medium white or yellow onion, cut into 1-inch pieces
                      
                    
                      
                        15 - 
                        1/2 red bell pepper (about 1 cup), cut into 1-inch pieces
                      
                    
                      
                        16 - 
                        1/2 green bell pepper (about 1 cup), cut into 1-inch pieces
                      
                    
                      
                        17 - 
                        1 cup pineapple chunks (fresh, frozen, or canned), cut into 1-inch pieces
                      
                    
                      
                        18 - 
                        1 teaspoon minced ginger
                      
                    
                      
                        19 - 
                        3 cloves garlic, minced
                      
                    
                      
                        20 - 
                        2 stalks scallions, cut into 1½-inch sections
                      
                    
                      
                        21 - 
                        Oil (canola, avocado, or other vegetable oils) for shallow-frying and sautéing