Serves8 
                    
                
                
                    
                        
                            - Active time:45 min
 
                        
                            - Start to finish:2 3/4 hr
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              February 2004
            
          
          
      
  
                
                
            
            
            
                Root vegetables have always been popular in Scandinavia because they store well during the long winter months and are therefore available year-round.
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
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                                            6
                                            
                                            medium beets (2 1/4 lb with greens), trimmed, leaving 1 inch of stems attached
                                            
                                        
 
                                    
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                                            1 (1-lb) 
                                            
                                            celery root (sometimes called celeriac) 
                                            
                                        
 
                                    
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                                            2 tablespoons plus 2 teaspoons 
                                            
                                            fresh lemon juice, plus additional to taste
                                            
                                        
 
                                    
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                                            2
                                            tablespoons
                                            minced shallot
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            cup
                                            olive oil
                                            
                                        
 
                                    
                                        - 
                                            3/4
                                            teaspoon
                                            salt
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            cup
                                            chopped walnuts (2 oz), toasted and cooled
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Put oven rack in middle position and preheat oven to 425°F.
                                         
                                    
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Wrap beets tightly in foil to make 2 packages (3 beets in each) and roast until tender, about 1 1/4 hours.
                                         
                                    
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While beets roast, peel celery root with a sharp knife and cut into 1/8-inch-thick matchsticks. Whisk together lemon juice, shallot, oil, salt, and pepper to taste in a large bowl until combined well, then add celery root and toss until coated. Keep at room temperature, covered, until ready to add beets.
                                         
                                    
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Carefully unwrap beets and, when just cool enough to handle, slip off skins and remove stems. Cut beets into 1/8-inch-thick matchsticks and toss with celery root.
                                         
                                    
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Let salad stand, covered, at room temperature 1 hour. Taste salad and season with more lemon juice and salt if necessary, then toss with walnuts.
                                         
                                    
                                
                             
                        
                    
                    Cooks' note: Toast nuts in a shallow baking pan in a 350° F oven until golden, 5 to 15 minutes.