→ For the Meatballs
                    
                      
                        01 - 
                        1½ pounds lean ground beef
                      
                    
                      
                        02 - 
                        ½ cup Panko breadcrumbs
                      
                    
                      
                        03 - 
                        1 large egg
                      
                    
                      
                        04 - 
                        ¼ cup ketchup
                      
                    
                      
                        05 - 
                        ¼ cup coarse grain mustard
                      
                    
                      
                        06 - 
                        1 tablespoon Worcestershire sauce
                      
                    
                      
                        07 - 
                        1 teaspoon seasoning salt
                      
                    
                      
                        08 - 
                        ½ teaspoon black pepper
                      
                    
                      
                        09 - 
                        1 teaspoon onion powder
                      
                    
                      
                        10 - 
                        2 tablespoons olive oil, for frying
                      
                    
                  
                    → For the Gravy
                    
                      
                        11 - 
                        2 tablespoons unsalted butter
                      
                    
                      
                        12 - 
                        1 large onion, finely chopped
                      
                    
                      
                        13 - 
                        2 tablespoons all-purpose flour (or cornstarch slurry)
                      
                    
                      
                        14 - 
                        1 cup low-sodium beef broth
                      
                    
                      
                        15 - 
                        1 tablespoon Worcestershire sauce
                      
                    
                      
                        16 - 
                        ½ teaspoon seasoning salt
                      
                    
                      
                        17 - 
                        1 tablespoon ketchup
                      
                    
                      
                        18 - 
                        1 tablespoon fresh parsley, chopped (for garnish)