Peanut Butter Fudge Cake
["2 sticks margarine", "1/4 c. cocoa", "1 c. water", "1/2 c. buttermilk", "2 beaten eggs", "1 1/2 c. peanut butter", "1 1/2 Tbsp. oil", "1/4 c. cocoa", "2 c. granulated sugar", "2 c. flour", "1 tsp. baking soda", "1 tsp. vanilla", "1 stick margarine", "6 Tbsp. buttermilk", "1 box xxxx sugar", "1 tsp. vanilla"]
["Stir the first 5 ingredients over medium-low heat.", "Stir constantly until it bubbles.", "Mix hot mixture into dry mixture. Pour into greased and floured 9 x 13-inch pan.", "Bake at 350\u00b0 for 25 to 35 minutes.", "Let cool and cover with peanut butter, mixed with oil.", "Over this, add icing."]
["margarine", "cocoa", "water", "buttermilk", "eggs", "peanut butter", "oil", "cocoa", "sugar", "flour", "baking soda", "vanilla", "margarine", "buttermilk", "xxxx sugar", "vanilla"]