From Joy of Cooking, original edition. We usually double this recipe.
Cream butter and sugar. Beat in egg and vanilla or almond extract. Combine flour, salt, and lemon rind and add to wet ingredients, mix to form dough. Chill dough 3 to 4 hours before rolling. Preheat oven to 350 degrees. Roll and cut out. Bake on a greased cookie sheet 8 to 10 minutes or until lightly colored.