Pecan Cookies
["1 egg white", "1 c. chopped pecans", "1 c. powdered sugar", "1/2 tsp. vanilla", "1/2 tsp. vinegar"]
["Beat egg white stiff.", "Beat in sifted sugar.", "Add vinegar and vanilla.", "Fold in pecans.", "Drop on greased baking sheet.", "Bake 12 to 15 minutes at 300\u00b0."]
["egg", "pecans", "powdered sugar", "vanilla", "vinegar"]