STEP 2.
Place butter and sugar into the bowl of an electric mixer and beat until pale and creamy. Add eggs one at a time until well incorporated.

STEP 3.
Add sour cream, followed by the flour, almond meal and spice. Mix until batter is smooth. Add sultanas, mixing in well. Spoon into prepared pan, smoothing the top. Sprinkle with diced apples.

STEP 4.
For the crumble, combine oats, sugar and butter in a bowl and using fingertips, rub to combine so mixture resembles chunky breadcrumbs. Mix in the almonds. Sprinkle over apples and bake for 1 hour or until an inserted skewer comes out clean. Serve warm with custard or cream.