Serves6 to 8 (main course)
                    
                
                
                    
                        
                            - Active time:20 min
 
                        
                            - Start to finish:45 min
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              October 2008
            
          
          
      
  
                
                
            
            
            
                Nuggets of sausage give a little meatball action to this hearty, no-fuss soup chock-full of healthy escarole and lentils.  Watch the cooks in The Test Kitchen taste this soup. 
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1 2/3
                                            cups
                                            lentils (11 oz), rinsed well
                                            
                                        
 
                                    
                                        - 
                                            5
                                            cups
                                            water
                                            
                                        
 
                                    
                                        - 
                                            3 1/2
                                            cups
                                            reduced-sodium chicken broth
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            Turkish or 1/2 California bay leaf
                                            
                                        
 
                                    
                                        - 
                                            4
                                            
                                            garlic cloves, finely chopped, divided
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            extra-virgin olive oil
                                            
                                        
 
                                    
                                        - 
                                            1
                                            lb
                                            sweet Italian sausage links, cut into 1-inch pieces
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            medium onion, finely chopped
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            medium carrots, finely chopped
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            celery ribs, finely chopped
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            tomato paste
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            lb
                                            escarole, chopped (4 cups packed)
                                            
                                        
 
                                    
                                        - 
                                            1 to 2
                                            tablespoons
                                            red-wine vinegar
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
                
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
                                        - 
                                            
                                            
Simmer lentils, water, broth, bay leaf, and half of garlic in a 4-qt pot, uncovered, 12 minutes.
                                         
                                    
                                        - 
                                            
                                            
Meanwhile, heat oil in a wide heavy 5- to 6-qt pot over medium-high heat until it shimmers. Brown sausage, about 7 minutes. Transfer sausage with a slotted spoon to a bowl.
                                         
                                    
                                        - 
                                            
                                            
Reduce heat to medium and cook onion, carrots, celery, remaining garlic, 1 tsp salt, and 1/2 tsp pepper, stirring occasionally, until softened, about 5 minutes. Stir in tomato paste and cook, stirring, 2 minutes. Add sausage and lentils with cooking liquid and simmer, uncovered, until lentils are tender, 3 to 5 minutes.
                                         
                                    
                                        - 
                                            
                                            
Stir in escarole and cook until tender, about 3 minutes. Stir in vinegar to taste and season with salt and pepper. Discard bay leaf.