1. Preheat oven to 350. Place whole hazelnuts on a large cookie sheet. Bake for 8-12 minutes until fragrant. Be careful to not burn the nuts. Fresh from the oven place hazelnuts in a clean dish towel, rub against the towel to remove the skin. Grind or finely chop hazelnuts.
2. In a large mixing bowl, cream butter and sugar until light and fluffy. Mix eggs, yolks and vanilla well. Combine flour and salt and add a third at a time to the creamed mixture, beating well after each addition. Stir in nuts.
3. Roll dough into 1 inch balls. Place 2 inches apart on ungreased cookie baking sheets. Flatten each ball and place a Hershey Kiss in the center of each cookie.
4. Bake at 350 for 10-12 minutes until cookies have set. Only the bottom of cookie will turn golden brown. Watch the cookies closely as the tip of the chocolate can burn. Remove to wire racks to cool completely.

Makes 4 dozen cookies.