Tiny walnut cookies

• 2 egg yolks
• 2 tablespoons sugar
• a few drops of natura

Preheat the oven to 160°C (315°F). Line a baking tray with baking paper.

Using an electric stand mixer or hand-held beaters, whisk the egg yolks with the sugar and vanilla until the mixture is white and fluffy, doubled in size, and no grain of sugar can be felt if you rub some