Devil'S Food Cookies
["1/2 c. margarine", "1 c. brown sugar", "1 egg", "1 tsp. vanilla", "2 (1 oz.) squares unsweetened chocolate, melted and cooled", "2 c. sifted flour", "1/2 tsp. baking soda", "1/4 tsp. salt", "3/4 c. sour cream", "1/2 c. chopped nuts"]
["Cream butter and sugar until fluffy.", "Beat in egg and vanilla. Stir in melted chocolate.", "Add dry ingredients alternately with sour cream.", "Mix well.", "Stir in walnuts.", "Drop by spoonfuls on greased cookie sheets.", "Bake at 350\u00b0 for 10 to 12 minutes.", "Frost cool cookies with the following:", "3 cups confectioners sugar, 1 teaspoon butter and few drops lemon juice.", "Sprinkle with crushed nuts."]
["margarine", "brown sugar", "egg", "vanilla", "chocolate", "flour", "baking soda", "salt", "sour cream", "nuts"]