Brown Edge Wafers
["1/2 c. unsalted butter", "1/2 c. sugar", "1 egg white", "1 tsp. vanilla", "3/4 tsp. grated orange zest", "1/4 tsp. kosher salt (pickling salt)", "3/4 c. flour"]
["Cream the butter and sugar.", "Add other ingredients.", "Beat by hand.", "Drop on lightly greased cookie sheet.", "Bake at 350\u00b0.", "Watch carefully.", "Done when edge of cookie is slightly browned.", "Makes about 35."]
["unsalted butter", "sugar", "egg", "vanilla", "orange zest", "kosher salt", "flour"]