Makesabout 3/4 cup
                    
                
                
                    
                        
                            - Active Time:15 min
 
                        
                            - Start to Finish:15 min
 
                        
                    
                
             
            
                
                    
                    Look for wild garlic and lamb's-quarter at your local farmers market in the spring and summer.
                
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              January 2007
            
          
          
      
  
                
                
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1/4
                                            cup
                                            pine nuts
                                            
                                        
 
                                    
                                        - 
                                            3 to 4
                                            
                                            wild garlic cloves or 1 small regular clove, chopped (1 teaspoon)
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            teaspoon
                                            salt
                                            
                                        
 
                                    
                                        - 
                                            2
                                            cups
                                            loosely packed lamb's-quater leaves (sometimes called wild spinach or fat hen), washed and dried
                                            
                                        
 
                                    
                                        - 
                                            3/4
                                            oz
                                            finely grated Parmigiano-Reggiano (1/3 cup)
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            extra-virgin olive oil
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Put oven rack in middle position and preheat oven to 350ºF.
                                         
                                    
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Toast nuts in a shallow baking pan in oven, stirring once or twice, until pale golden, about 10 minutes.
                                         
                                    
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Mince chopped garlic and mash to a paste with salt using side of a large heavy knife, then transfer to a food processor. Add lamb's-quarter and pulse until finely chopped. Add cheese and toasted nuts and process until nuts are finely chopped. With motor running, add oil in a thin stream through feed tube. 
                                         
                                    
                                
                             
                        
                    
                    Cooks' notes: - For pasta with pesto: Put 2/3 cup pesto in a large bowl and cook 1 pound pasta until al dente, then whisk about 1/3 cup pasta cooking water into pesto. Add drained pasta to thinned pesto with salt and pepper to taste and toss well. Serve with additional grated Parmigiano-Reggiano.
 - Pesto keeps, frozen in an airtight container, 3 months.