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                        01 - 
                        4 medium-sized sweet potatoes
                      
                    
                  
                    → Filling
                    
                      
                        02 - 
                        2 tablespoons olive oil
                      
                    
                      
                        03 - 
                        1 small onion, diced
                      
                    
                      
                        04 - 
                        2 cloves garlic, minced
                      
                    
                      
                        05 - 
                        2 cups fresh mushrooms, sliced (button or cremini)
                      
                    
                      
                        06 - 
                        3 cups fresh spinach leaves
                      
                    
                      
                        07 - 
                        1 tablespoon fresh rosemary, finely chopped (or 1 teaspoon dried)
                      
                    
                      
                        08 - 
                        Salt and black pepper, to taste
                      
                    
                      
                        09 - 
                        1/2 cup feta cheese, crumbled
                      
                    
                      
                        10 - 
                        1/4 cup chopped walnuts (optional)
                      
                    
                      
                        11 - 
                        1 teaspoon lemon zest
                      
                    
                      
                        12 - 
                        1/4 teaspoon red pepper flakes (optional)