Preheat oven to 160 degrees fan forced, and place rack into middle of oven
Prepare a large 25cm Bundt tin (important this is done well to prevent sticking) and place onto a baking tray
Get a large mixing bowl ready to put the apples and some of the batter in to
Put 350g apple quarters into TM bowl and chop 2 seconds x speed 4, stir mix around and repeat 2 seconds / speed 4 … there will be a mix of large and small pieces which is fine
Place apples into the large mixing bowl
Repeat process with the remaining apple quarters and add those to the mixing bowl too … do not clean TM bowl
Add the cinnamon and sugar mixture to the apples, along with the walnuts if using, and stir through … put aside
Place oil, lemon zest and juice, vanilla, eggs and sugar into ™ bowl and mix 10 seconds / speed 6
Insert your spatula into the base of the TM bowl and stir ensuring you lift any of the sugar that may have settled into the base off the bowl … mix for another 10 seconds / speed 6
Add flour, baking powder and salt and mix 6 seconds / speed 4
Stir mix around and repeat 4 seconds / speed 4
Pour a third of the batter into the prepared baking tin
Pour the rest of the batter into the mixing bowl with the apples and stir through
Add this mix to the baking tin and even out the top
Place baking tin on tray and bake for 1 hour 20 minutes, or until a skewer comes out clean (it takes exactly 1 hour 20 minutes in my oven)
Cool in tin for 10 to 15 minutes before turning onto a cake rack to cool completely (do not allow cake to cool completely in tin as it may be difficult to remove … that is what I have found)
Dust with cinnamon sugar whilst still warm if desired