Serves6 (main course) to 8 (first course)
                    
                
                
                    
                        
                            - Active time:1 1/4 hr
 
                        
                            - Start to finish:2 1/4 hr
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              October 2009
            
          
          
      
  
                
                
            
            
            
                Frying sage leaves is easy and provides a real wow factor. The sage and chestnuts make an ideal foil for these pillowy gnocchi. View more of our favorite recipes from this issue. 
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1 1/4
                                            lb
                                            russet (baking potatoes)
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            (3/4-lb) sweet potato
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            large egg
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            teaspoon
                                            grated nutmeg
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            grated Parmigiano-Reggiano plus more for serving
                                            
                                        
 
                                    
                                        - 
                                            1 1/2 to 2
                                            cups
                                            all-purpose flour plus more for dusting
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            extra-virgin olive oil
                                            
                                        
 
                                    
                                        - 
                                            1
                                            cup
                                            sage leaves (from  1 bunch)
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            bottled roasted chestnuts,  very thinly sliced with an  adjustable-blade slicer or  a sharp vegetable peeler
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            unsalted butter
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
                
            
            
            
            
                
                    
                    
                    
                        
                            
                                Make gnocchi:
                                
                                
                                    
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Preheat oven to 450°F with rack in middle.
                                         
                                    
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Pierce russet and sweet potatoes in several places with a fork, then bake in a 4-sided sheet pan until just tender,  45 minutes to 1 hour. 
                                         
                                    
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Cool potatoes slightly, then peel and force through ricer into sheet pan, spreading in an even layer. Cool potatoes completely.
                                         
                                    
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Lightly flour 2 or 3 large baking sheets or line with parchment paper. 
                                         
                                    
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Beat together egg, nutmeg, 1 tsp salt, and 1/2 tsp pepper in a small bowl. 
                                         
                                    
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Gather potatoes into a mound in sheet pan, using a pastry scraper if you have one, and form a well in center. 
                                         
                                    
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Pour egg mixture into well, then knead into potatoes. Knead in cheese and  11/2 cups flour, then knead, adding more flour as necessary, until mixture forms  a smooth but slightly sticky dough. Dust top lightly with some of flour.
                                         
                                    
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Cut dough into 6 pieces. Form 1 piece of dough into a 1/2-inch-thick rope on a  lightly floured surface. Cut rope into 1/2-inch pieces. Gently roll each piece into a  ball and lightly dust with flour. 
                                         
                                    
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Repeat with remaining 5 pieces of dough.
                                         
                                    
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Turn a fork over and hold at a 45-degree angle, with tips of tines touching work surface. Working with 1 at a time, roll gnocchi down fork tines, pressing with your thumb, to make ridges on 1 side. Transfer gnocchi as formed to baking sheets. 
                                         
                                    
                                
                             
                        
                            
                                Fry sage leaves and chestnuts: 
                                
                                
                                    
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Heat oil  in a 12-inch heavy skillet over medium heat  until it shimmers. Fry sage leaves in  3 batches, stirring, until they turn just a shade lighter and crisp (they will continue to crisp as they cool), about 30 seconds per batch. Transfer to paper towels to drain. Season lightly with salt. 
                                         
                                    
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Fry chestnuts in 3 batches, stirring, until golden and crisp, about 30 seconds  per batch. Transfer to paper towels to drain. Season lightly with salt. Reserve oil in skillet.
                                         
                                    
                                
                             
                        
                            
                        
                            
                                Cook gnocchi:
                                
                                
                                    
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Add half of gnocchi to a pasta pot of well-salted boiling water and stir. Cook until they float to surface,  about 3 minutes. Transfer with a slotted spoon to skillet with butter sauce.  Cook remaining gnocchi in same manner, transferring to skillet as cooked. 
                                         
                                    
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Heat gnocchi in skillet over medium heat, stirring to coat.
                                         
                                    
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Serve sprinkled with fried sage and chestnuts and grated cheese.
                                         
                                    
                                
                             
                        
                    
                    cooks’ notes: Uncooked gnocchi can be frozen (first in 1 layer on a baking sheet, then transferred to a sealable bag) up  to 1 month. Do not thaw before cooking. -  Chestnuts can be sliced 1 day ahead  and kept in an airtight container at cool room temperature. 
 - Sauce and topping can be halved;  make full recipe of gnocchi and freeze  half of it.