Preheat the oven to 375 degrees.
Grease an 8 or 9 inch baking pan on the bottom and the sides. Then line the bottom with parchment paper
Wash, peel and dice the apples. Set aside.
Sift or whisk the flour, spices, salt and baking powder together in a large mixing bowl. This will be the main mixing bowl so make sure it is large enough for the dough and apples.
Cut the butter into the flour mix.
Mix in the sugar and then add the apples and coat them with the mix.
Whisk together the milk and the eggs. Add this to the flour and apple mix and mix with a large spatula or wooden spoon. The batter will be really thick.
Add the dough to the prepared cake pan and smooth the top of the batter. Make sure that the batter all the way down in the cake pan along the sides too.
Sprinkle the additional sugar over the top of the cake.
Bake for 45-50 minutes. Use a tooth pick or a bamboo skewer to test for doneness in the center.
Let the cake cool in the pan for 10 minutes and then transfer to a wire rack.
Serve warm or cold with the custard sauce or clotted cream!