Makes24 Tartlets
                    
                
                
                    
                        
                            - Active Time:40 min
- Start to Finish:2 3/4 hr
 
            
                
                    
                    ADAPTED FROM DI MCDONALD
                
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              January 2007
            
          
          
      
  
                
                
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            For Dough
                            
                            
                                
                                    
                                        - 
                                            1 1/3
                                            cups
                                            all-purpose flour
                                            
                                        
- 
                                            2
                                            tablespoons
                                            sugar
                                            
                                        
- 
                                            1/4
                                            teaspoon
                                            salt
                                            
                                        
- 
                                            1
                                            
                                            stick (1/2 cup) cold unsalted butter, cut into 1/2-inch cubes
                                            
                                        
- 
                                            1
                                            
                                            large egg yolk
                                            
                                        
- 
                                            1 1/2
                                            tablespoons
                                            water plus additional if necessary
                                            
                                        
 
                    
                        
                            For Rhubarb Filling
                            
                            
                                
                                    
                                        - 
                                            1
                                            pound
                                            rhubarb stalks, trimmed and cut into 1-inch pieces
                                            
                                        
- 
                                            3/4
                                            cup
                                            sugar
                                            
                                        
 
                    
                 
            
            
            
            
            
                
                    
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                                Special equipment:a pastry or bench scraper; 2 mini muffin pans with 12 (1/8-cup) muffin cups 
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                                Accompaniment:crème fraîche, well stirred 
                    
                    
                    
                        
                            
                                Make dough:
                                
                                
                                    
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                                            Whisk together flour, sugar, and salt in a large bowl (or pulse in a food processor). Blend in butter with your fingertips or a pastry blender (or pulse) until mixture resembles coarse meal with some small (roughly pea-size) butter lumps. Beat together yolk and water with a fork and stir into flour mixture (or pulse) until incorporated. 
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                                            Gently squeeze a small handful of dough: If it doesn't hold together, add more ice water, 1/2 tablespoon at a time, stirring (or pulsing) until incorporated. Do not overwork dough, or pastry will be tough. 
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                                            Turn dough out onto a lightly floured surface and divide into 4 portions. With heel of your hand, smear each portion once in a forward motion to help distribute fat. Gather all of dough together with pastry scraper and transfer to a large sheet of plastic wrap. Roll dough into an 8-inch-long log (about 1 inch thick). Chill, wrapped in plastic wrap, until firm, at least 1 hour. 
 
                        
                            
                                Make filling while dough chills:
                                
                                
                                    
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                                            Cook rhubarb and sugar in a 2-quart heavy saucepan over moderately low heat, stirring, until juices are released by rhubarb. Continue to cook, stirring occasionally, until rhubarb is tender and falling apart and mixture is slightly thickened, 15 to 18 minutes. Cool to room temperature.  
 
                        
                            
                                Bake and fill tartlet shells
                                
                                
                                    
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                                            Put oven rack in middle position and preheat oven to 350°F. 
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                                            Cut dough crosswise into 24 slices and, using floured fingers, press each slice evenly onto bottom and up side of a muffin cup. Chill until cold and firm, about 15 minutes in refrigerator or 5 minutes in freezer. 
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                                            Put muffin pans on a baking sheet and bake until golden, 25 to 30 minutes. Cool tartlet shells in pans on a rack 5 minutes, then carefully remove from pans (use a small, sharp knife to loosen if necessary) and cool completely on racks. 
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                                            Fill tartlet shells with rhubarb (about 2 teaspoons filling per shell). Serve topped with dollops of crème fraîche. 
 
                        
                            
                        
                    
                    Cooks' notes: Pastry dough can be chilled up to 2 days.
Tartlet shells can be baked 2 days ahead and kept in an airtight container at room temperature.
Rhubarb filling keeps, covered and chilled, 3 days. Leftover filling can be used as a compote (spread on toast or as an accompaniment to meat or poultry).