1. Preheat the oven to 350°F. Line 3 to 4 baking sheets with nonstick baking paper. Cream the soy margarine and sugar together with an electric mixer until light and fluffy.

2. Beat in the flour, ground hazelnuts and egg yolk until evenly mixed.

3.Take a teaspoonful of mixture at a time and shape it into a smooth circle with your fingers. Place the circles well apart on the baking paper and press a whole hazelnut into the center of each one.

4. Bake the cookies, one tray at a time, for about 10 minutes, or until golden brown, then transfer to a wire rack using a small spatula. Sift confectioners' sugar over each cookie to cover. Let cool.