If you decide you want to make the cake I used which is mom's vintage mayo cake, here's the link to the recipe click here. This is has so many possibilities it can be used for in your favorite dessert recipes.
Kahlua Hot Fudge Sauce
1 (14 ounce) can sweetened condensed milk
2 (1 ounce) squares unsweetened chocolate, chopped
1/8 teaspoon salt
1/3 cup water
1/2 teaspoon pure vanilla
1 tablespoon of Kahlua ( I like to add a little more your by choice, omit vanilla add another 1 1/2 tablespoons)
Combine condensed milk, chocolate and salt in top of double boiler over rapidly boiling water. Stir and cook until chocolate melts and mixture thickens, about 10 minutes.
Remove from heat and stir in water, a little at a time, until sauce reaches desired consistency. Cool slightly and stir in vanilla add Kahlua. Serve over your favorite cake, ice cream, bread pudding or as a cheesecake topping.