Cream butter or margarine and sugar together.
Blend in coffee; add flour gradually, and mix thoroughly.
Roll out 1 /2 inch thick, and cut into fingers.
Dip fingers in egg white; then roll in finely chopped nuts.
Place on ungreased baking sheets.
Bake at 300Â°F. 20-25 minutes.
Cool; store in covered tin, with waxed paper between each layer of cookies.
Makes about 4 dozen.Squares, Bars and Molded Cookies