Lightly grease jelly roll pan 15 1/2: x 10 1/2" x 1"
Mix butter , sugar and egg yolk.
Measure flour by dipping or sifting, blend in cinnamon.
Stir into butter mixture and pat into pan.
Beat water and egg white till frothy, brush over dough. Sprinkle nuts on top of egg white.
Bake 20-25 minutes or until very lightly brown.
Cut immediately into 3" by 1" bars. Cool. Makes about 50.
Notes
from Abella kitchen: I like a thicker cookie so I make 1 1/2 batch in a stone jelly roll pan, pricking the dough before putting the froth from one egg on top. Increasing the time to 35 minutes and increasing the nuts to 3/4 cup.