Chocolate Macaron
                            
                                1.
                                Sift the flour and beat the egg whites until completely
                            
                            
                                2.
                                Mix the egg whites with the sieved flour into a ribbon shape
                            
                            
                                3.
                                Put it into a piping bag with a round mouth, and let it dry in a ventilated place until the surface is dry
                                    
                            
                            
                                4.
                                Put into the preheated oven, 200℃, middle level, about 2 minutes, turn to 130℃, 16 minutes
                            
                            
                                5.
                                Squeeze the ganache filling on the back of the baked macaron, cover with a piece of macaron, and sift the cocoa powder on the surface. Just mix the melted butter well)