• Preheat the oven to 356 °F // 180 °C top/bottom heat.
• Line two baking sheets with parchment paper and set them aside.
• Grab a mixing bowl. Add the yolks, powdered sugar, vanilla sugar, and a pinch of salt.
  ¾ cup Powdered sugar, 2 tsp Vanilla sugar, 1 Pinch Salt, 8 Egg yolk
• Mix the ingredients with an electric hand mixer together until the mixture is light yellow and fluffy.
• Sift the flour through a close-meshed sieve and gently fold it into the yolk mixture.
  1 cup Cake flour
• Fill the egg yolk batter into a piping bag.
• Once the piping bag is full, cut off the tip and start piping small dots or drops onto the already prepared baking sheets.
• Once both trays are covered with droplets of dough, put the tray in the oven and bake on the middle rack for 8-10 minutes.
• Let them cool before you start assembling them.
• Take two cookies at a time, and assemble them with the jam.
  2 tsp Jam

Chocolate Decoration

• Melt the chocolate in a water bath, microwave, or tempering device.
  ¼ cup Dark chocolate couverture
• Drizzle the melted chocolate over the assembled cookies.
• Once the chocolate is solid, you can store the cookies in an airtight container lined with baking paper.