Thumb Print Pecan Cookies
["1/2 c. butter", "1/4 c. sugar", "1 egg yolk, slightly beaten", "1 c. flour", "1 egg white, unbeaten", "3/4 c. nut meats, cut fine"]
["Cream butter.", "Add sugar gradually and cream until light.", "Add egg yolk.", "Mix thoroughly and blend in flour.", "Form into small balls (about 1-inch in diameter).", "Dip into egg white, then into nuts.", "Place on greased cookie sheet and press firmly flat with bottom of glass.", "Bake in slow oven (300\u00b0) for 5 minutes.", "Remove from oven and press centers down and bake about 15 minutes.", "Cool and fill with a tart jelly or jam.", "Makes 15 to 18 cookies."]
["butter", "sugar", "egg yolk", "flour", "egg", "nut meats"]