Make the cookie dough

• In a deep bowl, combine the softened butter, powdered sugar and vanilla sugar and mix until smooth.
• Add the beaten egg, finely ground pistachios, cornstarch, baking powder and flour.
• Mix well and knead until smooth.

Shape the cookies

• Take a small amount of dough and place two pistachios in the center.
• Enclose the dough around the pistachios and roll it between your palms into a smooth ball.
• Place the cookies on a baking tray lined with parchment paper.

Bake the cookies

• Bake in a preheated oven at 190 °C for 10-15 minutes, keeping an eye on them as every oven may vary.
• Allow the cookies to cool completely.

Coat and garnish

• Dip the cooled cookies one by one in the melted white chocolate.
• Place them on a sheet of parchment paper and garnish with stripes of white chocolate, finely ground pistachios and rose petals.
• Let the chocolate set.