→ Apple Filling
                    
                      
                        01 - 
                        450 g medium firm apples (preferably Granny Smith or Honeycrisp), peeled, cored, and thinly sliced
                      
                    
                      
                        02 - 
                        28 g unsalted butter
                      
                    
                      
                        03 - 
                        45 g brown sugar
                      
                    
                      
                        04 - 
                        25 g granulated sugar
                      
                    
                      
                        05 - 
                        1 tsp ground cinnamon
                      
                    
                      
                        06 - 
                        ¼ tsp ground nutmeg
                      
                    
                      
                        07 - 
                        1 tsp fresh lemon juice
                      
                    
                      
                        08 - 
                        1 tsp cornstarch mixed with 10 ml water (slurry)
                      
                    
                  
                    → Pastry
                    
                      
                        09 - 
                        1 sheet of thawed puff pastry (approx. 250 g), high-quality with multiple layers
                      
                    
                      
                        10 - 
                        1 large egg beaten with 15 ml milk or water for egg wash
                      
                    
                  
                    → Topping
                    
                      
                        11 - 
                        120 ml caramel sauce, store-bought or homemade
                      
                    
                      
                        12 - 
                        Optional: powdered sugar, whipped cream, or vanilla ice cream for serving