Chocolate Cake
["3 sq. unsweetened chocolate", "2 1/4 c. flour", "2 tsp. baking soda", "1/2 tsp. salt", "2 1/4 c. (1 lb.) brown sugar", "3 eggs", "2 tsp. vanilla", "1/2 c. buttermilk", "1 c. boiling water"]
["Melt chocolate over hot water.", "Sift flour, soda and salt on wax paper.", "Cream margarine and butter.", "Add sugar.", "Beat in eggs one at a time.", "Stir in vanilla and chocolate.", "Add flour mixture a third at a time alternately with buttermilk.", "Stir in hot water and pour into 3 (9-inch) greased cake pans.", "Bake in 375\u00b0 oven for 25 to 30 minutes."]
["unsweetened chocolate", "flour", "baking soda", "salt", "brown sugar", "eggs", "vanilla", "buttermilk", "boiling water"]