Production Method: 1: Prepare the required materials. 2: Mix egg yolk with 30g sugar, beat and stir well. 3: Pour the milk and stir evenly. 4: Pour the melted butter and stir evenly. 5: Add sifted low-gluten flour. 6: Stir into a smooth and even batter. 7: Beat the egg whites with a whisk to a coarse bubble state and add 15 grams of sugar. 8: Add 15 grams of granulated sugar when it is sent to a delicate state. 9: Add the last remaining 15 grams of caster sugar when the lines appear. 10: until the egg whites appear in a hard foaming state with sharp corners. 11: Take one third of the egg white paste and add it to the egg yolk paste, and mix it up and down. 12: Pour the mixed egg yolk paste into the egg white paste and continue to mix evenly. 13: Preheat the mold for a minute or two after greased. 14: Pour the batter. 15: Heat on medium and low heat, bake each side for a minute or two, then turn it over, turn it over twice for about 4 minutes.