Adapted from Around My French Table by Dorie GreenspanDorie doesn’t specify any type of apple but instead advises that you should use a mix of them. I don’t know what kind mine were since Romain brought them to me. The rum is really a great flavor in this cake, but if you’re avoiding alcohol, you could double or triple the vanilla to compensate. I also like this recipe because you can make it with ingredients easily on hand. Being American, I was tempted to add a dusting of ground cinnamon to the apples, but then it wouldn’t be authentically French. Hence I often decide to add a dollop of crème fraîche alongside, but it's wonderful just as it is.The original recipe uses a springform pan but if you don't have one, you can use an 8-inch (20cm) cake pan, buttering it well and lining the bottom with a circle of parchment paper before adding the batter. I've also make it in a 9-inch (23cm) cake pan and it works well, although it won't be a high.