Peel the apples and cut into 1 cm thick wedges, mix with lemon juice and layer in a small greased casserole dish. First work the flour, sugar, butter, cinnamon, salt and the finely chopped almonds and walnuts into crumble with the kneading peg on the mixer and then with your hands. Spread evenly over the apples and bake in a preheated oven at 150 ° for about 30 minutes. Distribute on plates while still lukewarm and dust with powdered sugar.
Whipped cream or vanilla sauce goes well with it, whatever you want. The crumble will be particularly crispy if you prepare it a day in advance and keep it in a cool place.