Serves4
                    
                
                
                    
                        
                            - Active time:40 min
 
                        
                            - Start to fnish:2 hr (includes chilling)
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              August 2007
            
          
          
      
  
                
                
            
            
            
                Think meatless has to mean boring? These delicious patties, made with earthy portabella mushrooms and hearty kasha, defy the bland reputation of vegetarian burgers. A fiery dollop of chipotle mayonnaise makes them even more irresistible.
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            2/3
                                            cup
                                            water
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            coarse kasha (whole roasted buckwheat groats)
                                            
                                        
 
                                    
                                        - 
                                            1
                                            lb
                                            portabella mushrooms, stems discarded
                                            
                                        
 
                                    
                                        - 
                                            1
                                            cup
                                            finely chopped onion
                                            
                                        
 
                                    
                                        - 
                                            1
                                            cup
                                            finely chopped red bell pepper
                                            
                                        
 
                                    
                                        - 
                                            3
                                            tablespoons
                                            unsalted butter
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            garlic cloves, finely chopped
                                            
                                        
 
                                    
                                        - 
                                            3
                                            tablespoons
                                            finely chopped flat-leaf parsley
                                            
                                        
 
                                    
                                        - 
                                            1
                                            teaspoon
                                            soy sauce
                                            
                                        
 
                                    
                                        - 
                                            1 1/2
                                            cups
                                            fine dry bread crumbs, divided 
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            large egg, lightly beaten
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            cup
                                            olive oil
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            cup
                                            mayonnaise
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            Tabasco chipotle sauce, or to taste
                                            
                                        
 
                                    
                                        - 
                                            8
                                            
                                            large oval slices rye bread, cut into 4 1/2-inch rounds if desired, lightly toasted
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Bring water to a boil in a 1- to 1 1/2-quart heavy saucepan, then stir in kasha. Cover and reduce heat to low, then cook until kasha is tender and water is absorbed, about 10 minutes. Transfer to a bowl and cool.
                                         
                                    
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Break one third of mushrooms into a food processor and pulse until finely chopped, then transfer to a bowl. Repeat with remaining 2 batches of mushrooms, transferring to bowl.
                                         
                                    
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Cook onion and bell pepper in butter in a 12-inch heavy skillet over medium heat, stirring occasionally, until softened, about 5 minutes. Add chopped mushrooms, garlic, 3/4 teaspoon salt, and 1/2 teaspoon pepper and cook over medium-high heat, stirring occasionally, until any liquid mushrooms give off is evaporated and mushrooms begin to brown, 8 to 10 minutes. Transfer mixture to a large bowl, then stir in kasha, parsley, soy sauce, and 1/2 cup bread crumbs until combined well. Cool 10 minutes, then stir in egg until combined well.
                                         
                                    
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Line a platter with foil. Spread remaining cup bread crumbs in a shallow baking dish.
                                         
                                    
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Form one fourth of mushroom mixture (about 3/4 cup) into a 3/4-inch-thick patty (3 1/2 inches in diameter), then dredge in bread crumbs, knocking off excess, and transfer to platter. Form and dredge 3 more patties, transferring to platter. Chill patties, loosely covered with plastic wrap, 1 hour.
                                         
                                    
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Heat oil in cleaned 12-inch heavy skillet over medium-high heat until it shimmers, then fry patties, turning over once, until deep golden, about 4 minutes total. Transfer patties to paper towels to drain (patties will be soft).
                                         
                                    
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Meanwhile, whisk together mayonnaise and chipotle sauce.
                                         
                                    
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Spread bread with chipotle mayonnaise and sandwich each mushroom patty between 2 slices.
                                         
                                    
                                
                             
                        
                    
                    Cooks’ note: Patties can be formed, without bread-crumb coating, 12 hours ahead and chilled, covered.