For the pastry:
285g plain flour
150g unsalted butter or margarine
Zest of 1 lemon
2 tsp lemon juice
1 egg
75g caster sugar
For the fruit filling:
75g sultanas
50g chopped walnuts
1 tsp ground cinnamon
1 dessert apple, peeled and grated
50g soft brown sugar
50g unsalted butter or margarine
For the glaze:
1 egg white lightly whisked
2 tbsp hundreds and thousands