I would like to add here that a few people have been trying this recipe with mixed results. A few said that the cake took over an hour to cook and it seemed that the batter didn't set. I think if your apples are too juicy, the cake will be very wet and seem as if it isn't cooked. I remade it, using only Golden Delicious apples, and it came out perfectly, so I can tell you for sure that they are perfect for the cake. Using these apples, this cake took 45 minutes to cook in a fan oven at 160°C. When I made it with a mixture of Granny Smith and Fuji apples, it took 55 minutes to cook at the same temperature.