Makesabout 1 lb
                    
                
                
                    
                        
                            - Active time:25 min
 
                        
                            - Start to finish:1 1/4 hr
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              April 2002
            
          
          
      
  
                
                
            
            
            
                The sponge candy’s tender crunch melts in your mouth.
            
            
            
            
            
                
                    
                    
                    
                        
                            
                            
                            
                                
                                    
                                        - 
                                            1 1/2
                                            cups
                                            sugar
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            water
                                            
                                        
 
                                    
                                        - 
                                            3
                                            tablespoons
                                            unsalted butter
                                            
                                        
 
                                    
                                        - 
                                            1/4
                                            teaspoon
                                            cream of tartar
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            cup
                                            mild molasses
                                            
                                        
 
                                    
                                        - 
                                            2 1/2
                                            teaspoons
                                            baking soda
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                
                                
                                
                                    
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Line bottom and sides of a 13- by 9-inch baking pan with foil, then butter foil.
                                         
                                    
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Bring sugar, water, butter, and cream of tartar to a boil in a deep 3-quart heavy saucepan over moderate heat, stirring until sugar is dissolved, then wash down any sugar crystals with a pastry brush dipped in cold water. Boil without stirring until syrup registers 265°F (hard-ball stage) on a candy thermometer, about 10 minutes. Add molasses (don’t stir) and continue to boil undisturbed until syrup registers 295°F (hard-crack stage), 4 to 5 minutes. Remove pan from heat and sift baking soda over syrup, then whisk to incorporate. (Use caution: mixture will bubble vigorously.)
                                         
                                    
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Immediately pour syrup into lined baking pan and cool completely. Lift candy in foil from pan, then discard foil and break candy into pieces.
                                         
                                    
                                
                             
                        
                    
                    Cooks’ note: Candy keeps, layered between wax paper in an airtight container, 1 month.