Filled with spices, buttermilk, and jam, this moist cake has been in the baking repertoire of my husband's family for over a century. Although this particular recipe hails from Bowling Green, Kentucky, I found many other recipes for jam cake that originated further south. At first glance, I mistakenly thought the jam was merely a filling between the cake layers but to my happy surprise, the jam is actually an ingredient in the batter, creating a lovely berry hue to the cake and an even better berry taste. This down-home cake traditionally calls for a sweet caramel frosting, but I opted for a decadent caramel chocolate ganache. Make the ganache before you make the cake as it needs about 3 hours to firm up at room temperature (and is so much better when not refrigerated).