Mix flour, almonds, icing sugar and salt in a bowl. Add egg and butter in pieces. Knead first with the dough hooks of the hand mixer, then briefly with your hands to a smooth short pastry. Wrap the dough in foil and chill for about 30 minutes
Put the Amarettini in a freezer bag and crush them finely with a rolling pin. Wash, peel and quarter the apples and remove the core. Cut apples into slices and turn them in lemon juice
Grease a tart mould with lift-off base (26 cm Ø) and dust lightly with flour. Roll out the short pastry on a large, lightly floured sheet of baking paper to form a circle (approx. 30 cm Ø). Turn out the dough into the tin and remove the baking paper. Slightly press the rim and cut off any excess dough. Prick the base of the dough several times with a fork and sprinkle with the Amarettine crumbs
Put milk in a bowl, add cream powder and mix with a whisk for about 1 minute. Spoon the cream onto the base and spread carefully. Cover with apple slices in a circle
Bake in the preheated oven, lower rack (electric oven: 200 °C/ convection oven: 175 °C/ gas: level 3) for 45-50 minutes. Warm the jelly slightly. After 20-25 minutes, brush the apple slices with the jelly and bake until done. Let the tart cool down for 20-30 minutes on a cake rack, then carefully remove from the tin and let it cool down
Waiting time approx. 40 minutes