Could this be the recipe?

Spanish Bar Cake

Recipe by: compiled from various internet sources
Yields: one 9 x 13 in. cake

Cake Ingredients:
2 cups flour
1 1/2 cups sugar
1 1/2 teaspoons baking soda
1 tablespoon cocoa (I used Dutch process)
1 teaspoon cinnamon
1 teaspoon salt
1 teaspoon nutmeg
1 teaspoon allspice
1/2 cup vegetable oil
2 cups applesauce
2 eggs
1 1/2 cups raisins, soaked in warm water until plump and drained

Buttercream Frosting Ingredients:
1 cup white shortening
1 cup butter, softened
8 cups confectioner’s sugar
1 teaspoon pure vanilla extract (can use clear if you want the frosting to be snow white)
4-6 tablespoons milk for thinning to desired consistency

Directions:
Preheat oven to 350 degrees F. Prepare a 9 x 13 in. baking pan with cooking spray (or butter and flour). Plump the raisins in warm water (I do this in a measuring cup that I’ll use for wet ingredients later — one less dish to clean).

In a large bowl, whisk all dry ingredients together. Add oil, applesauce, and eggs. Mix well. Add in raisins and stir to combine. Pour batter into prepared pan, rapping 3-4 times on a counter to release trapped air bubbles. Bake for 30-35 minutes or until a toothpick inserted into the center comes out with only a few moist crumbs. Let cake cool completely before frosting.

To prepare frosting, mix all ingredients until well combined. Add more milk if needed for consistency. Frost completely cool cake. Use a fork to rake grooves into the frosting to resemble A&P’s cake presentation.

The cake sounds delicious, can't wait to try it.  Maybe I'll bake it to bring to my cousin's for the 4th of July.  Thanks for the recipe.