Soak gelatine in plenty of cold water for 10 minutes. Squeeze the gelatine and dissolve at low heat. Mix lemon juice, cream, sugar, vanillin sugar and the dissolved gelatine.
Chill for 3-4 hours. For the dough, mix flour, nuts, sugar, egg and fat flakes into a short pastry. Wrap the dough in cling film and chill for about 30 minutes. Portion the dough into 6 pieces.
Roll out on a lightly floured work surface in circles of approx. 12 cm Ø each. Grease small tartlet cups (8-10 cm Ø), place the dough in them and press on the edges. Prick the dough several times with a fork.
Place a piece of baking paper on the bottom of the dough and pour legumes on top (this is called "blind baking"). Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 8 minutes.
Remove the legumes and paper and bake for another 8 minutes. Carefully remove from the tin and let it cool on a cake rack. Whip the cream until stiff with the whisk of the hand mixer.
Pour into a piping bag with a star-shaped spout and squirt onto the cakes. Wash peaches, dab dry, halve and stone. Cut the flesh into slices. Cover the tartlets with it. Heat the jam, pass through a sieve and spread on the peach slices.
Decorate with lemon slices, rasp and peppermint. Makes about 6 pieces.