Heritage Chocolate Cake
["2/3 c. butter or margarine, soften", "1 3/4 c. sugar", "3 eggs", "1 tsp. vanilla extract", "2 c. all-purpose flour", "1/2 c. cocoa", "1 tsp. baking powder", "3/4 tsp. baking soda", "1/2 tsp. salt", "1 1/2 c. buttermilk or sour milk", "1/3 c. butter or margarine", "1/3 c. cocoa", "2 2/3 c. confectioners sugar", "1/3 c. milk", "1 tsp. vanilla extract"]
["Melt butter and cocoa on low until smooth and thickened.", "Pour into small bowl and cool.", "Add vanilla.", "Add sugar and milk alternately until desired consistency."]
["butter", "sugar", "eggs", "vanilla extract", "flour", "cocoa", "baking powder", "baking soda", "salt", "buttermilk", "butter", "cocoa", "confectioners sugar", "milk", "vanilla extract"]