Peel and quarter the apples and cut out the cores. Halve the apple quarters and cut into pieces. Boil up apples, 1/2 l water, lemon juice, 125 g sugar and vanilla sugar. Cover and simmer for 3-5 minutes, depending on the type of apple, until they are soft but not yet crumbled.
Mix the pudding powder with 5 tablespoons of cold water until smooth. Pour apples into a sieve, collecting the liquid. Drain the apples. Measure out 400 ml of liquid, bring to the boil and stir in the pudding powder.
While stirring at least
Simmer for a minute. Fold in apple pieces. Leave to cool for about 2 hours.
Grease a pie or springform pan (approx. 26 cm Ø) and dust with flour. Finely chop the nuts. Knead the flour, 150 g sugar, 1 pinch of salt, egg yolk, nuts and butter in flakes first with the dough hooks of the mixer, then quickly with your hands to form crumbles.
Preheat oven (electric cooker: 200°C/circulating air: 175°C/gas: level 3). Press a good 2/3 of the crumbles in the mould to form a base, pressing up a rim approx. 3 cm high. Sprinkle the base with breadcrumbs.
Spread apple compote over it. Spread the remaining crumbles on the compote. Bake in a hot oven for 55-60 minutes. If necessary, cover with aluminium foil about 15 minutes before the end of the baking time. Let it cool down. Serve with crème fraîche.