Prepared pan: A 9-inch tube pan sprayed with vegetable oil spray
Mix apple filling ingredients.
The cake will have a better texture if you precook the apples a bit, but this is optional:
Heat 1 T. oil in a large frying pan. Add the filling ingredients and heat until the sugar is brown and the mixture begins to thicken. Remove from heat.
Put all batter ingredients in the large bowl of a mixer and beat at medium speed for 2 minutes until quite smooth. Layer in 3 batches in a tube pan, each layer beginning with batter and ending with apples. Over the top layer, pour any of the apple juices remaining in the bowl.
Bake for 60 minutes. Then lower the temperature to 300°, and bake an additional 45 minutes. Check with a toothpick or cake tester to be sure the cake is done (tester comes out clean) before removing from the oven.
Cool about 30 minutes before removing from pan. Loosen the cake along the side and around the tube with a table knife. Place a small cooling rack over the top of the pan, carefully invert, remove the pan, and invert again onto a serving plate. This takes some practice because the cake is dense and a bit fragile. It will fall apart if you try to unmold it while it is too hot, but it becomes too hard to loosen from the pan if it gets too cold - 30 minutes after baking is a reasonable compromise. When I first started baking this cake, my husband always lent an extra pair of hands for the unmolding.