Serves6 to 8
                    
                
                
                    
                        
                            - Active time:35 min
 
                        
                            - Start to finish:1 1/4 hr
 
                        
                    
                
             
            
            
                
                
                
    
      
          
          
          
              
              
              
          
          
          
          
          
              
              
              March 2004
            
          
          
      
  
                
                
            
            
            
                This variation on the classic Irish apple cake has a top and bottom crust made from a biscuitlike dough. You can cut this cake into wedges or dish it out with a spoon like a cobbler.  Browse nearly a dozen more rhubarb recipes in our slideshow. 
            
            
            
            
            
                
                    
                    
                    
                        
                            For cake
                            
                            
                                
                                    
                                        - 
                                            1
                                            lb
                                            fresh rhubarb stalks, cut into 1/2-inch pieces (3 cups), or 3 cups frozen rhubarb, thawed after measuring
                                            
                                        
 
                                    
                                        - 
                                            1
                                            cup
                                            packed light brown sugar
                                            
                                        
 
                                    
                                        - 
                                            2
                                            cups
                                            cake flour (not self-rising), sifted
                                            
                                        
 
                                    
                                        - 
                                            3/4
                                            teaspoon
                                            baking powder
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            cup
                                            plus 2 tablespoons granulated sugar
                                            
                                        
 
                                    
                                        - 
                                            1
                                            
                                            stick (1/2 cup) cold unsalted butter, cut into 1/2-inch cubes
                                            
                                        
 
                                    
                                        - 
                                            1/3
                                            cup
                                            whole milk
                                            
                                        
 
                                    
                                        - 
                                            2
                                            
                                            large eggs (1 separated)
                                            
                                        
 
                                    
                                
                            
                         
                    
                        
                            For whiskey cream
                            
                            
                                
                                    
                                        - 
                                            1
                                            cup
                                            chilled heavy cream
                                            
                                        
 
                                    
                                        - 
                                            2
                                            tablespoons
                                            confectioners sugar
                                            
                                        
 
                                    
                                        - 
                                            1
                                            tablespoon
                                            whiskey (preferably Irish)
                                            
                                        
 
                                    
                                        - 
                                            1/2
                                            teaspoon
                                             vanilla
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                                Make cake:
                                
                                
                                    
                                        - 
                                            
                                            
Put oven rack in middle position and preheat oven to 400°F. Butter a 10-inch glass or ceramic pie plate or a 2 1/2-quart oval gratin dish and chill.
                                         
                                    
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Toss rhubarb with brown sugar in a bowl until coated.
                                         
                                    
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Whisk together flour, baking powder, and 1/2 cup granulated sugar in a large bowl until combined well. Blend in butter with a pastry blender or your fingertips until mixture resembles coarse meal. Whisk together milk, whole egg, and yolk. Make a well in center of flour mixture and add milk mixture, stirring with a wooden spoon to gradually incorporate flour and form a soft, sticky dough.
                                         
                                    
                                        - 
                                            
                                            
Transfer half of dough to chilled pie plate and pat out over bottom and halfway up side with well-floured hands, then spoon rhubarb and any juices onto dough. Using a tablespoon, spoon remaining dough in small mounds evenly over top. Lightly beat egg white with a few drops of water, then lightly brush cake with egg wash. Sprinkle remaining 2 tablespoons granulated sugar over top.
                                         
                                    
                                        - 
                                            
                                            
Bake cake until top crust is golden and rhubarb is tender, 30 to 40 minutes. Transfer to a rack to cool, about 30 minutes.
                                         
                                    
                                
                             
                        
                            
                                Make whiskey cream:
                                
                                
                                    
                                        - 
                                            
                                            
Beat cream with confectioners sugar, whiskey, and vanilla in a bowl with an electric mixer until it forms stiff peaks.
                                         
                                    
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Serve cake warm or at room temperature with whiskey cream.
                                         
                                    
                                
                             
                        
                    
                    Cooks’ note: Cake can be made 4 hours ahead and cooled completely, then kept, wrapped well in plastic wrap, at room temperature. Reheat if desired.