1. In a pot of hot water, mix egg whites and sugar, add vanilla extract and lemon juice, and stir to raise the temperature to 55-60 degrees, then remove from the pot. 2. After whipping until the horns are soft, pour them into 6 bowls little by little and mix with food coloring to color. 3. Rotate the piping bag by color and apply it to the wall, then fill the center with the white meringue. 4. Pan in a pan and bake in an oven preheated to 90-100 degrees for about 90 minutes.