I've never baked or eaten this cake. I came across this recipe while looking at old family recipes.
2 medium-sized potatoes
1 cup margarine
2 cups flour
1/2 teaspoon baking soda
2 cups sugar
4 eggs
1 teaspoon baking powder
1 teaspoon salt
1 teaspoon each: cinnamon, nutmeg & cloves (cloves are strong; 1 tsp. of them may be too much)
1/2 cup buttermilk
1 teaspoon vanilla
3 squares unsweetened chocolate, melted (I remember Grandma having Baker's chocolate squares, but I don't know if that was for this recipe.)
1 cup chopped walnuts or pecans
Peel & dice potatoes; cook in boiling salted water, covered, about 10 minutes, or until tender. Drain & mash, cover & keep warm over very low heat.
Combine flour with baking powder, soda, salt & spices.
Cream sugar & margarine until fluffy. Beat in eggs one at a time, beating well after each addition.
Alternately add dry ingredients with buttermilk, beating just to blend. Measure 1 cup mashed potatoes & add along with melted chocolate & vanilla. Beat to blend. Stir in nuts. Turn into 2 greased 9-inch layer cake pans. Bake in moderate oven (350*) 20-30 minutes. Frost as desired.