To make the dough, beat together the egg yolks, caster sugar and vanilla until thick and pale. Add the butter and beat to combine. Add the flour and mix until combined.
Tip onto a well-floured bench. With floured hands, bring the dough together to form a ball. Divide into 2 and wrap in cling film and freeze for 2 hours. (I did this first thing in the morning).
To make the filling, peel and grate the apples into a colander. Allow to sit in the colander for 15 minutes, then squeeze the juice out. In a bowl, combine the apple with the sultanas, jam, coconut, cinnamon and lemon zest.
Coarsely grate 1 of the frozen dough pieces evenly over the tin base, then gently press down. Spread the apple filling evenly over the base. Grate the other frozen dough evenly over the top. Sprinkle with cinnamon sugar. Bake for 45 minutes. Allow cooling before removing from the tin. Serve with cream or custard.
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