Heat oven to 300F.

Butter and line a 23cm cake tin. Coat the apples in lemon juice and set aside.

In a large bowl beat the butter and sugar until pale and fluffy, add the eggs and beat until smooth. Sift in the flour, baking powder and half tsp salt. Mix until incorporated. Slowly add the milk, mixing well after each addition until you have a smooth batter.

Transfer the batter to the tin and arrange the apples in a spiral over the batter. Mix the sugar and cinnamon and sprinkle on top. Bake for 40 to 45 minutes.