This is my father-in-law's mother's cake recipe from Oklahoma, and I'm posting it for safe keeping. Word (word in our family, that is) has it that no one made a mayonnaise cake like she did. She would always send one back with my husband's family when they made a trip out to Oklahoma to visit from Colorado. The frosting she put on it was boiled sugar frosting, and my father-in-law's father apparently liked frosting so much it was like, "How about a little cake with your frosting?" That's what I've heard anyway. ;) I've tried to make the boiled sugar frosting a couple times, but it doesn't come out right (maybe it's the Colorado altitude, maybe it's my cooking skills, maybe it was a grandma thing [she did have 50 years of making it behind her]. Who knows.), but my husband - the grandchild that loves mayonnaise cake the most out of all of them, so much so that we were gifted the "mayonnaise cake pan" upon the grandmother's passing - likes it just as much with this chocolate frosting. The frosting recipe is adapted from Hershey's and works swimmingly, whether you're a grandma or not. ;) Oh, this cake is also great when it's chilled - it makes it more dense and SO good.