Koulourakia(Greek Butter Cookies)  
["1 lb. butter (room temperature)", "2 c. sugar", "6 eggs", "2 tsp. vanilla extract", "8 to 9 c. flour", "2 Tbsp. double-acting baking powder", "1 egg, beaten with 1 Tbsp. water", "2 lemon rinds, grated"]
["Preheat oven to 375\u00b0.", "Cream butter gradually beating in sugar. Beat eggs until light; add to butter mixture and beat thoroughly. Add vanilla extract.", "Add lemon rinds.", "Sift together flour and baking powder.", "Carefully blend into butter-egg mixture to make soft dough."]
["butter", "sugar", "eggs", "vanilla extract", "flour", "double-acting baking powder", "egg", "lemon rinds"]