1 large Bramley apple, peeled, core removed, sliced, mixed with 1 tbsp lemon juice
100²µ/3½´Ç³ú plain flour
100²µ/3½´Ç³ú light soft brown sugar
125²µ/4½´Ç³ú caster sugar
½ tsp ground cinnamon
¼ tsp grated nutmeg
100²µ/3½´Ç³ú sultanas (optional)
1 vanilla pod, split lengthways, seeds only
250g/9oz oat biscuits, crushed
50g/2oz unsalted butter
100²µ/3½´Ç³ú butter
400g/14oz cream cheese
4 free-range eggs
500g/1lb 2oz mascarpone cheese
1 tsp milk
1 x 150ml/5fl oz tub soured cream