What you need to make them:
A pinch of salt
3 egg whites
1 teaspoon lemon juice
food coloring - optional
How you make them:
Step1: Preheat your oven to 100 degrees Celsius.
Step2: Separate your egg yolks from your egg whites.
Step3: Whisk the egg whites and the salt until it's become a hard foam.
Step4: Add the sugar and whisk until the foam has become shiny.
Step5: Add the lemon juice and the food coloring.
Step6: Put some baking paper on top of a baking sheet and either pipe the mixture on top of the baking paper or just use a spoon.
Step7: bake for about 50 minutes to an hour. Take them out, let them cool and then eat them or use them as decoration for something.