Whisk the egg whites with a pinch of salt until it gets fluffy.
When the egg whites get fluffy, add the caster sugar little by little, and continue whisking.
Add the vanilla extract.
The important criteria for the egg whites are to become solid, to hang in the beater, and to avoid sugar crumbs when you touch them.
When the meringue mixture turns into a giant foam, add the red, green, and white food colorings to the meringue mixture.
Put the parchment paper on a baking tray, and pipe the meringues.
Decorate them as you wish.
Bake in a preheated oven at 230 F for 1.5 hours.
After cooking, let them rest for 1-2 hours until the meringue gets hard **without opening the oven door.