Serves6
                    
                
                
                    
                        
                            - Active time:15 min
- Start to finish:30 min
 
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              May 2008
            
          
          
      
  
                
                
            
            
            
                Visually, this dish speaks softly, but it combines quite a number of sensations: a buttery fish, sautéed for a crisp skin, and a broth of such depth you’ll never believe it was simmered for just five minutes. The mixture of enoki and shimeji mushrooms looks gorgeous and lends a meatiness, punctuated by an elusive woodsy smokiness, to the sansho-flecked broth.
            
            
            
            
            
                
                    
                    
                    
                        
                            For broth
                            
                            
                                
                                    
                                        - 
                                            1
                                            cup
                                            water
                                            
                                        
- 
                                            6
                                            tablespoons
                                            reduced-sodium soy sauce
                                            
                                        
- 
                                            2
                                            tablespoons
                                            mirin (Japanese sweet rice wine)
                                            
                                        
- 
                                            1/8
                                            teaspoon
                                            ground sansho pepper (sometimes labeled “sansyo”), plus additional for sprinkling, or 1 teaspoon whole Sichuan peppercorns
                                            
                                        
- 
                                            1
                                            
                                            shallot, sliced
                                            
                                        
- 
                                            3
                                            
                                            garlic cloves, thinly sliced, divided
                                            
                                        
- 
                                            2
                                            teaspoons
                                            vegetable oil
                                            
                                        
- 
                                            7
                                            oz
                                            fresh enoki mushrooms, cut into 3-inch lengths and spongy base discarded
                                            
                                        
- 
                                            5
                                            oz
                                            fresh shimeji mushrooms (sometimes called beech mushrooms), spongy base discarded
                                            
                                        
 
                    
                        
                            For fish
                            
                            
                                
                                    
                                        - 
                                            6
                                            
                                            (6-oz) pieces black cod fillet with skin
                                            
                                        
- 
                                            1
                                            teaspoon
                                            vegetable oil
                                            
                                        
 
                    
                 
            
            
            
            
            
                
            
            
            
            
                
                    
                    
                    
                        
                            
                                Make broth:
                                
                                
                                    
                                        - 
                                            
                                            Bring water, soy sauce, mirin, sansho pepper, shallot, and one third of garlic to a boil in a 1- to 2-quart heavy saucepan, then simmer 5 minutes. Let broth stand off heat 10 minutes. 
- 
                                            
                                            Cook remaining garlic in oil in a 10-inch heavy skillet over medium heat, stirring, until just golden. Add all mushrooms and cook, stirring occasionally, until tender, about 3 minutes. 
- 
                                            
                                            Strain broth through a fine-mesh sieve into mushroom mixture, discarding solids, and simmer 1 minute. 
 
                        
                            
                                Sauté fish:
                                
                                
                                    
                                        - 
                                            
                                            Pat fish dry and sprinkle with 1/2 teaspoon salt and 1/4 teaspoon pepper. Heat oil in a 12-inch heavy nonstick skillet over medium-high heat until hot, then sauté fish, skin side down, turning once, until golden brown, just starting to flake, and just cooked through, about 10 minutes. 
- 
                                            
                                            Transfer fish to shallow bowls. Reheat broth and divide among bowls, then sprinkle very lightly with more sansho pepper (if using). 
 
                        
                    
                    Cooks’ note: Broth can be made 1 day ahead and chilled, covered (once cool). Gently reheat before using.