(Seperate eggs -- yolks and whites in seperate bowls.)
In large bowl, cream brown sugar and margarine until light and fluffy. Blend in almond extract and egg yolks.
Gradually add flour, soda and salt to creamed mixture, mix well.
Shape dough into balls and roll in egg whites, walnuts and then place balls onto greased cookie sheet, two inches apart. With thumb, make imprint in center of each cookie and fill with jam. Roll in chopped nuts (optional)