Separate the eggs into whites and yolks.
Add lemon juice and a pinch of salt to the egg whites and whip until stiff peaks form.
Mix vanilla extract and sugar with the egg yolks.
Gently combine the whipped egg whites with the yolk mixture.
Shape the batter into rounds on a baking sheet.
Bake in a preheated oven at 170°C (340°F) for 20 minutes.