01 - 
                        1 lb fettuccine.
                      
                    
                      
                        02 - 
                        2 tablespoons olive oil.
                      
                    
                      
                        03 - 
                        3 tablespoons butter (use separately).
                      
                    
                      
                        04 - 
                        4 garlic cloves, finely chopped.
                      
                    
                      
                        05 - 
                        3 leeks, medium-sized, tops removed, halved, and finely sliced.
                      
                    
                      
                        06 - 
                        2 sage leaves, fresh.
                      
                    
                      
                        07 - 
                        ¾ cup thick heavy cream.
                      
                    
                      
                        08 - 
                        ⅓ cup dry sherry wine.
                      
                    
                      
                        09 - 
                        1 tablespoon balsamic vinegar.
                      
                    
                      
                        10 - 
                        ½ cup gruyere cheese, grated.
                      
                    
                      
                        11 - 
                        ¼ cup toasted pine nuts.
                      
                    
                      
                        12 - 
                        ½ teaspoon regular salt.
                      
                    
                      
                        13 - 
                        1 teaspoon lemon zest.
                      
                    
                      
                        14 - 
                        ½ teaspoon sugar (granulated).
                      
                    
                      
                        15 - 
                        8 ounces oyster mushrooms.
                      
                    
                      
                        16 - 
                        1 teaspoon cracked black pepper.
                      
                    
                      
                        17 - 
                        1 cup pasta water (saved).