Sift the flour and add with the baking soda and the salt. Mix thoroughly and add the reserved hazelnuts. Using a teaspoon, form the dough into balls and arrange them 2 inches apart on baking sheets that have been greased or lined with parchment paper. Using the prongs of a fork that have been dipped into flour to prevent sticking, flatten the balls into 1 1/2 inch rounds (Tip: If you want a clearly visible criss-cross design on the cookies, chill dough for 30 minutes before doing so).
05Bake in the middle of the oven for 8-to-9 minutes or until the cookies are golden. Cool on racks. The cookies will keep for about a week in a sealed jar.