Preheat oven to 350 degrees.
Chop nuts in food processor until very fine. Beat butter, nuts, salt and granulated sugar in mixer bowl until light. Beat in flour into blended.
Shape dough into 1 inch balls.
Place 2 inches apart on ungreased cookie sheets and flatten to 1 1/2 inch circle.
Press into centers with a fingertip.
Fill each indentation with 1/4 teaspoon preserves.
Bake 10-12 minutes, until golden.
Cool.
Sift confectioner's sugar over cookies.
Makes 6 dozens.