STEP 1/15
                            Separate 4 eggs into white and yolk.
                            
                         
                                                
                            STEP 2/15
                            Whisk egg whites using a whisk.
                            
                         
                        
        
        
        
                        
                            STEP 3/15
                            Add 1/3 of 70g of sugar and whip it again.
                            
                         
                                                
                            STEP 4/15
                            Add sugar three times and whip.
                            
                         
                                                
                            STEP 5/15
                            Whip egg white meringue until firm. It's done if it's shaped like a horn.
                            
                         
                        
        
        
        
                        
                            STEP 6/15
                            Add 2 egg yolks to this and whip it again.
                            
                         
                                                
                            STEP 7/15
                            Add the remaining 2 eggs and whip the rest.
                            
                         
                                                
                            STEP 8/15
                            Put 100g of soft flour through a sieve.
                            
                         
                        
        
        
        
                        
                            STEP 9/15
                            Please knead it with a spatula.
                            
                         
                                                
                            STEP 10/15
                            When the dough is complete, add 30g of melted butter in the microwave.
                            
                         
                                                
                            STEP 11/15
                            Knead the melted butter as if cutting it with a spatula.
                            
                         
                        
        
        
        
                        
                            STEP 12/15
                            Pour the dough into the air fryer with paper foil. And level the dough by tapping it to make it is flat.
                            
                         
                                                
                            STEP 13/15
                            Bake at 150 degrees for 30 minutes.
                            
                         
                                                
                            STEP 14/15
                            After 30 minutes, poke the castella with chopsticks and if there's nothing on it, it's done. Cook a little more if there's anything that comes out.
                            
                         
                        
        
        
        
                        
                            STEP 15/15
                            Airfryer Castella with a good soft texture is complete!
                            
                         
                                            
                        Whip the meringue until firm as a horn.