Serves8
                    
                
                
                    
                        
                            - Active Time:30 min
 
                        
                            - Start to Finish:30 min
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              September 2003
            
          
          
      
  
                
                
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            4
                                            teaspoons
                                            Sherry vinegar
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            minced shallot
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            teaspoon
                                            Dijon mustard
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            teaspoon
                                            salt
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            teaspoon
                                            black pepper
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            cup
                                            extra-virgin olive oil
                                            
                                        
 
                                    
                                        - 
                                            2
                                            teaspoons
                                            finely chopped fresh tarragon
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            lb
                                            frisée (French curly endive), torn into bite-size pieces
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            head Boston lettuce (1 lb), torn into bite-size pieces
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            bunch arugula (1/2 lb), coarse stems discarded
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            bunch watercress (1/2 lb), coarse stems discarded
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Whisk together vinegar, shallot, mustard, salt, and pepper in a small bowl, then add oil in a slow stream, whisking until emulsified. Whisk in tarragon.
                                         
                                    
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Toss greens with dressing in a large bowl and season with salt and pepper.
                                         
                                    
                                
                             
                        
                    
                    Cooks’ note: Greens can be washed, trimmed, and torn 1 day ahead and chilled in a sealed plastic bag lined with paper towels.