Makes1 (9-inch) tart
                    
                
                
                    
                        
                            - Active time: 20 min
Total time: 4 hrs (includes cooling) 
                        
                    
                
             
            
                
                    
                    This triple threat dessert offers three distinct textures and flavors: A nutty, crumbly crust is filled with a dark chocolate pudding enriched with bittersweet chocolate, cocoa, and chocolate stout, then topped with a billowy bourbon whipped cream. 
                
 
            
            
                
                
                
    
      
  
                
                
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
INGREDIENTS:
                            
                            
                        
                    
                        
                            For Crust:
                            
                            
                                
                                    
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                                            1/2 cup unsalted roasted almonds (see Cooks’ Notes) 
                                            
                                        
 
                                    
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                                            15 chocolate wafer cookies (such as Famous Chocolate Wafers; 4 oz)
                                            
                                        
 
                                    
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                                            2 tablespoons packed light brown sugar
                                            
                                        
 
                                    
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                                            5 tablespoons unsalted butter, melted
                                            
                                        
 
                                    
                                
                            
                         
                    
                        
                            For Filling:
                            
                            
                                
                                    
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                                            1 cup whole milk 
                                            
                                        
 
                                    
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                                            1/2 cup heavy cream 
                                            
                                        
 
                                    
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                                            1/2 cup chocolate stout, preferably double chocolate stout (to measure, tilt cup and pour it slowly down side of a liquid measuring cup, then let foam dissipate or skim it off)
                                            
                                        
 
                                    
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                                            2 tablespoons packed light brown sugar
                                            
                                        
 
                                    
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                                            2 tablespoons unsweetened cocoa powder
                                            
                                        
 
                                    
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                                            2 tablespoons cornstarch 
                                            
                                        
 
                                    
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                                            2 ounces good-quality bittersweet chocolate (60 - 62% cacao), finely chopped 
                                            
                                        
 
                                    
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                                            1/2 teaspoon pure vanilla extract
                                            
                                        
 
                                    
                                
                            
                         
                    
                        
                            For Cream Topping:
                            
                            
                                
                                    
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                                            1 cup chilled heavy cream
                                            
                                        
 
                                    
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                                            2 tablespoons bourbon
                                            
                                        
 
                                    
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                                            2 teaspoons sugar
                                            
                                        
 
                                    
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                                            1/4 teaspoon pure vanilla extract 
                                            
                                        
 
                                    
                                
                            
                         
                    
                 
            
            
            
            
            
            
            
            
                
                    
                    
                    
                        
                            
                        
                            
                        
                            
                        
                            
                                Make Crust:
                                
                                
                                    
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Preheat oven to 350°F with rack in middle.
                                         
                                    
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Pulse almonds with cookies and sugar in a food processor until almonds and cookies are finely ground.
                                         
                                    
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Add butter and pulse to combine, then press evenly onto bottom and up side of tart pan or 1-inch up side of springform pan (a dry measuring cup with a smooth bottom is very useful for pressing crumbs into an even layer).
                                         
                                    
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Bake until set, 15 minutes. Cool on a rack 1 hour.
                                         
                                    
                                
                             
                        
                            
                                Make Filling: 
                                
                                
                                    
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Whisk together milk, cream, stout, sugar, cornstarch, and cocoa in a medium saucepan and bring to a boil over medium heat, whisking constantly, then briskly simmer, whisking constantly, 2 minutes. 
                                         
                                    
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Remove from heat and whisk in chopped chocolate and vanilla until smooth.
                                         
                                    
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Pour chocolate custard into cooled tart shell and cover surface with plastic wrap or wax paper (to prevent a skin from forming) and chill until set, about 3 hours.
                                         
                                    
                                
                             
                        
                            
                                Make Cream Topping:
                                
                                
                                    
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Beat cream, bourbon, sugar, and vanilla in a bowl with an electric mixer just until stiff peaks form. Spread whipped cream decoratively on top of pie.
                                         
                                    
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Garnish with chocolate shavings or dust with cocoa powder, if desired.
                                         
                                    
                                
                             
                        
                            
                                COOKS’ NOTES:
                                
                                
                                    
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If you can’t find unsalted roasted almonds, buy whole raw almonds (with skins). Roast them in a rimmed sheet pan in a preheated 350°F oven until golden and fragrantly toasty (cut open an almond to see if the insides are golden), 8 to 10 minutes. Let cool completely. 
                                         
                                    
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Tart (without cream topping) can be made 1 day ahead and kept chilled, its surface covered with plastic wrap. 
                                         
                                    
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Whipped cream topping can be added 3 hours ahead and kept chilled, uncovered.
                                         
                                    
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To make chocolate shavings, have a bar of bittersweet chocolate at room temperature. Holding the chocolate with a paper towel, pass a vegetable peeler over the edge or side of the bar. The chocolate will curl up like wood shavings.