Makesabout 50 hors d’oeuvres
                    
                
                
                    
                        
                            - Active Time:1 hr
 
                        
                            - Start to Finish:1 hr
 
                        
                    
                
             
            
                
                    
                    It looks like a Japanese roll—but it’s not! Green beans stand in for the traditional scallion; thin slices of prosciutto replace beef.
                
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              December 2007
            
          
          
      
  
                
                
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1/2
                                            lb
                                            haricots verts, trimmed
                                            
                                        
 
                                    
                                        - 
                                            3
                                            
                                            hard-boiled large eggs, quartered
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            mayonnaise
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            teaspoon
                                            grated lemon zest
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            tablespoon
                                            fresh lemon juice, or to taste
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            minced scallions (2 to 3)
                                            
                                        
 
                                    
                                        - 
                                            15
                                            
                                            thin slices prosciutto (about 7 by 3 inches; 1/2 pound)
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Cook haricots verts in a large pot of boiling salted water (3 tablespoons salt for 6 quarts water), uncovered, until just tender, 4 to 5 minutes. Drain, then transfer to an ice bath to stop cooking. Drain and pat dry.
                                         
                                    
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Force hard-boiled eggs through a medium-mesh sieve into a bowl using a rubber spatula. Stir in mayonnaise, zest, lemon juice, scallions, 1/2 teaspoon pepper, and 1/4 teaspoon salt (or to taste).
                                         
                                    
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Place a sushi mat with slats running crosswise or a 9-inch square of parchment paper on a work surface. Arrange 3 slices prosciutto perpendicular to slats and slightly overlapping to form a 9- by 7-inch rectangle.
                                         
                                    
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Spread about 1 tablespoon egg mixture evenly across bottom half of prosciutto rectangle. Arrange beans on egg side by side and end to end, overlapping ends, in 8 tight rows parallel to slats. Spread another tablespoon egg mixture over beans.
                                         
                                    
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Roll up prosciutto and beans tightly with aid of mat. Transfer roll, seam side down, to a cutting board, then trim ends and cut crosswise into about 10 (3/4-inch) pieces. Make and cut 4 more rolls. Turn pieces upright to serve.
                                         
                                    
                                
                             
                        
                    
                    Cooks’ note: Prosciutto rolls can be assembled (but not cut into pieces) 1 day ahead and chilled, each roll wrapped tightly in plastic wrap. Cut rolls while cold, then bring to room temperature, covered with plastic wrap, before serving, about 30 minutes.