• 3 egg yolks
• 1 cup powdered sugar
• 1 teaspoon ground cardamom
• 1 teaspoon vanilla extract
• 3/4 cup chopped walnuts
• slivered pistachios (optional)

Preheat the oven to 325 degrees F (165 degrees C). Line a baking sheet with parchment paper. Mix together yolks, sugar, cardamom, and vanilla in a bowl with an electric mixer at high speed until creamy and light in color, about 5 minutes. Stir in walnuts. Drop teaspoons of batter onto prepared baking sheet, spacing about 1 inch apart. Top with pistachios. Bake until lightly browned, about 15 minutes. Cool completely on baking sheet.