The secret to this take on salad lyonnaise is very fresh eggs. If the slab bacon you're using is particularly lean, add 1 tablespoon vegetable oil to the skillet when cooking.
                
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              February 1999
            
          
          
      
  
                
                
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1/2
                                            lb
                                            frisée (French curly endive)
                                            
                                        
- 
                                            6
                                            oz
                                            slab bacon or thick-cut bacon slices
                                            
                                        
- 
                                            2
                                            tablespoons
                                            distilled white vinegar
                                            
                                        
- 
                                            4
                                            
                                            large eggs
                                            
                                        
- 
                                            2
                                            tablespoons
                                            chopped shallot
                                            
                                        
- 
                                            3
                                            tablespoons
                                            red-wine vinegar
                                            
                                        
 
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
                                        - 
                                            
                                            Tear frisée into bite-size pieces and put in a large bowl. If using slab bacon, cut lengthwise into 1/4-inch-thick slices. Cut bacon slices crosswise into 1/4-inch-thick sticks (lardons). 
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                                            In a heavy skillet cook bacon over moderate heat, stirring occasionally, until golden and remove skillet from heat. 
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                                            Have ready another skillet with 1 inch warm water. Half-fill a 4-quart saucepan with water and stir in white vinegar. Bring liquid to a bare simmer. Break each egg into a teacup. Slide 1 egg into simmering liquid and immediately push white around yolk with a slotted spoon, moving egg gently. (Egg will become oval, with yolk completely covered by white.) Add remaining 3 eggs in same manner. Simmer eggs about 1 1/2 minutes for runny yolks to about 3 minutes for firm yolks. (Serving this salad with runny—not fully cooked—yolks may be of concern if there is a problem with salmonella in your area.) Immediately transfer eggs to skillet of warm water. 
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                                            Reheat bacon in its skillet over moderate heat. Add shallot and cook, stirring, 1 minute. Add red-wine vinegar and boil 5 seconds. Immediately pour hot dressing over frisée and toss with salt and pepper to taste. 
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                                            Divide salad among 4 plates and top with drained poached eggs. Season eggs with salt and pepper and serve salad immediately.