Mississippi Mud Cake
["1/2 c. cocoa", "2 c. sugar", "1 1/2 c. self-rising flour", "2 sticks margarine, melted", "1/4 tsp. salt", "4 eggs", "1 tsp. vanilla", "1 1/2 c. pecans, broken", "1 box confectioners sugar", "1/2 c. cocoa", "1 stick margarine", "1/2 c. milk"]
["Bake cake in a 13 x 9-inch baking pan."]
["cocoa", "sugar", "flour", "margarine", "salt", "eggs", "vanilla", "pecans", "confectioners sugar", "cocoa", "margarine", "milk"]