1. Pour the egg whites into an anhydrous and oil-free dish, add powdered sugar and lemon juice.
2. Use an electric whisk at low speed until wet foaming.
3. Add coloring and vanilla extract.
4. Stir it slightly with a spatula, the uneven color will look better.
5. Put the piping mouth into the piping bag, apply a toothpick to the piping bag with a little pigment, and put the mixed egg white paste.
6. Extrusion pattern.
7. Put it into the middle layer of the preheated oven, and heat up and down at 100 degrees for 55 minutes.
8. After being baked, you can enjoy it after cooling down.
9. It melts in your mouth and is very delicious.
Please adjust the temperature according to the temperament of your own oven. The baking pan should be lined with greased paper to facilitate demoulding.