→ For the Beef
                    
                      
                        01 - 
                        1 pound beef sirloin or tenderloin, cut into strips
                      
                    
                      
                        02 - 
                        2 tablespoons olive oil or butter
                      
                    
                      
                        03 - 
                        Salt and freshly ground black pepper to taste
                      
                    
                  
                    → For the Sauce
                    
                      
                        04 - 
                        1 medium onion, finely chopped
                      
                    
                      
                        05 - 
                        2 cloves garlic, minced
                      
                    
                      
                        06 - 
                        8 ounces fresh mushrooms, sliced
                      
                    
                      
                        07 - 
                        1 cup beef broth
                      
                    
                      
                        08 - 
                        1 tablespoon Worcestershire sauce
                      
                    
                      
                        09 - 
                        1 tablespoon Dijon mustard
                      
                    
                      
                        10 - 
                        1 cup sour cream
                      
                    
                  
                    → For Serving
                    
                      
                        11 - 
                        8 ounces egg noodles
                      
                    
                      
                        12 - 
                        Fresh parsley for garnish (optional)