Serves4 (main course) 
                    
                
                
                    
                        
                            - Active time:30 min
 
                        
                            - Start to finish:50 min
 
                        
                    
                
             
            
                
                    
                    CHRIS SCHLESINGER AND JOHN WILLOUGHBY
                
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              June 2009
            
          
          
      
  
                
                
            
            
            
                Searing the tuna well on the outside but leaving it rare on the inside gives you a lovely contrast between the two textures. That said,  if you like your tuna cooked through, the salad will still be delicious.    
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1/3
                                            cup
                                            extra-virgin olive oil
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            Asian sesame oil
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            soy sauce
                                            
                                        
 
                                    
                                        - 
                                            6
                                            tablespoons
                                            rice vinegar (not seasoned)
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            minced peeled ginger
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            coriander seeds, coarsely crushed 
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            white peppercorns, coarsely crushed
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            kosher salt
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            vegetable oil
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            (1-lb) sushi-grade tuna steak (about 2 inches thick)
                                            
                                        
 
                                    
                                        - 
                                            1
                                            lb
                                            jicama, peeled
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            bunches watercress (10 oz), tough stems discarded 
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            scallions, very thinly sliced  
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Prepare grill for direct-heat cooking over hot charcoal (high heat for gas); see “
Grilling Procedure.”
 
                                         
                                    
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Whisk together olive oil, sesame oil, soy sauce, vinegar, and ginger.
                                         
                                    
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Combine coriander seeds, white peppercorns, and kosher salt  in a small bowl.
                                         
                                    
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Rub vegetable oil all over tuna, then coat with spice mixture, pressing gently to help it adhere.  
                                         
                                    
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Oil grill rack, then grill tuna, covered only if using a gas grill, turning onto all sides, until seared on all sides but still very rare inside,  6 to 8 minutes total. Transfer tuna to a cutting board and cut across the grain into 8 slices. 
                                         
                                    
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Julienne jicama using an adjustable-blade slicer fitted with 1/8-inch julienne attachment or using a knife.  
                                         
                                    
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Toss watercress and jicama with enough dressing to coat, then season with salt and pepper. 
                                         
                                    
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Serve tuna over salad, sprinkled with scallions. Serve remaining dressing on the side.  
                                         
                                    
                                
                             
                        
                    
                    Cooks’ notes: - The tuna in this recipe will not be fully cooked.  
 -  Tuna can be cooked in a lightly oiled hot grill pan over medium-high heat.
 -  Tuna can be grilled 1 day ahead and chilled (covered once cool).
 - We also have a Web-exclusive recipe using the leftover coriander seeds.