This is the cake my mother used to ship with my dad for his birthday when he worked at Whiteco Industries.
It started with just a couple and in the end she would make 12 or so and freeze 2 for Christmas. Here is the recipe:
Prune Cake:
preheat oven to 350
MIX DRY
2 cups flour
2 cups sugar
1 tspn salt
1 tspn baking soda
1.5 tspns cinnamon
1.5 tspns nutmeg
1.5 tspns allspice
ADD
1 cup oil
1 cup buttermilk
3 eggs
1 cup nuts (walnuts)
1 cup prunes (chopped)
MIX WELL
grease 9x9 pans and pour in ingredients
bake at 350 for 45 minutes
TOPPING
in a sauce pan MIX:
1 cup buttermilk
1 cup sugar
1 tspn soda
1 stick butter
bring to a boil pour liquid over cake