Coffee Walnut Cake

Directions

1. Place potato in a small saucepan and cover with water. Bring to a boil. Reduce heat; cover and cook for 10-15 minutes or until tender. Drain, reserving 2/3 cup cooking water. Mash potato and set aside. Dissolve coffee granules in reserved cooking water; set aside.
2. In a large bowl, cream butter and brown sugar until light and fluffy. Beat in the eggs, vanilla and mashed potato. Combine the flour, baking powder and salt; add to creamed mixture with 1/2 cup reserved coffee.
3. Pour into a greased 13x9-in. baking dish. Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool on a wire rack.
4. In a large bowl, combine the confectioners' sugar, butter, cocoa, vanilla and remaining coffee. Frost cake. Sprinkle with walnuts.