Place the berry mixture in a bowl and allow to thaw. Mix flour, oat flakes, salt and brown sugar in a bowl. Whisk the egg. Add butter in pieces, 3 tbsp. water and whisked egg to the flour mixture.
First work into a smooth short pastry with the dough hooks of the hand mixer, then with your hands. Form the dough into a roll (approx. 15 cm Ø) and cut into 6 slices. Grease Tartelette moulds with lift-off base (approx. 12 cm Ø) and line with dough.
Press down the edge of the blade. Chill the Tartelettes for about 30 minutes.
Cut the vanilla pod in half lengthwise and scrape out the pulp. Mix red wine, vanilla pulp and sugar. Put the cake glaze into a small pot and stir it gradually with the red wine mixture until smooth. Add the vanilla pod to the red wine-berry mixture and bring to the boil while stirring continuously.
Remove the vanilla pod.
Quickly fold the berry mixture into the red wine mixture and spread on the Tartelettes. Place the Tartelettes in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see manufacturer) 20-25 minutes
Take out the Tartelettes, let them cool down for about 15 minutes, then put them in the refrigerator for 2 hours.
Mix sour cream, vanilla sugar and honey. Arrange the tartelettes with the sour cream.