Makesabout 2 tablespoons
                    
                
                
                    
                        
                            - Active time:10 min
 
                        
                            - Start to finish:6 1/4 hr
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              March 2008
            
          
          
      
  
                
                
            
            
            
            
            
            
            
                
            
            
            
            
            
                
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Preheat oven to 175ºF with rack in middle. Put liner in a 4-sided sheet pan.
                                         
                                    
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Cut tomatoes crosswise into 1/8-inch-thick slices and arrange in 1 layer in pan.
                                         
                                    
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Dry tomato slices in oven, turning over once, until completely dehydrated and crisp, 5 to 5 1/2 hours. Cool completely.
                                         
                                    
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Crumble tomato into grinder and grind to a fine powder. Transfer to a fine-mesh sieve set over a bowl. Shake powder through sieve, then discard any pieces remaining in sieve.
                                         
                                    
                                
                             
                        
                    
                    Cooks’ note: Powder keeps in an airtight container at room temperature indefinitely.