Bake at 375 F. Glaze. Add grated lemon rind and vanilla. Mix egg yolks alternately with spoons of flour into batter. Work in remaining flour until dough is firm but smooth. Place a small piece of dough in the palm of your hand and roll between palms into a small ball, about 1 inch in diameter.
Place cookies on baking pan, allowing space between cookies.
With your finger make a small indentation in center of each cookie. You can bake them plain or brush edges lightly with beaten egg white and top with chopped almonds. Place almonds in a pointed paper cup or a cone of wax paper and cut off tip. This will make it easier for you to garnish the cookies. Bake in preheated oven 350 F. for 20-25 minutes of until lightly colored.