Grandma's "Secret" Birthday Cake

Most families have those secret recipes that are cherished during celebrations and holidays. For me, one of those great mysteries was my Grandma's Birthday Cake. Growing up we were always hoping that she would work her magic and make one for our special day. It was a moist chocolate cake, layered with this delicious white cream and then covered in smooth chocolate frosting. The pieces seemed large, but yet went away so quickly. When I reached my young adult years, I finally asked my grandmother her magical recipe. I was hoping that I could one day make this wonderful treat for my own kids or better yet sell the recipe and make a ton of money. Imagine my surprise when I was told the following:
* Cake: Devil's Food Cake mix
* Frosting: Can of Chocolate Frosting
* Filling: 1/2 c. butter, 1/2 c. Crisco and 1 c. sugar. Beat until creamy. Slowly add 3/4 c. warm (scalded) milk and 1 teaspoon vanilla. Beat for 5 minutes.

Guess I won't be making millions and I didn't really want to know that Crisco is involved, but at least I got the recipe and know I can make my own damn, good cakes!