Jam-Filled Pine Nut Cookies

In a large bowl, beat butter and sugar with electric mixer on medium speed until light and fluffy. Beat in egg yolks and almond extract. On low speed, beat in flour and salt until blended. Cover; refrigerate 1 hour

Heat oven to 350.° Shape dough into 1" balls. In small bowl, slightly beat egg whites

Dip each ball in egg whites; roll in pine nuts, pressing to adhere

On ungreased cookie sheets, place balls 2" apart. Press thumb in center of each ball to make an indentation

Spoon about 1/2 tsp. preserve into each indentation

Bake 13 to 15 min. or until light brown. Remove from cookie sheets to cooling racks. Cool complete