Mix together the flour, sesame seeds, sugar and butter to a breadcrumb consistency.
Add the vanilla extract and mix together into a ball.
Add the chocolate and berries and work into the dough. Shape the dough into a sausage.
Wrap the dough in plastic film and leave to rest in the refrigerator for 1 hour. Preheat the oven to 175°C and cut the dough roll into 1 cm thick pieces.
Transfer to a baking sheet and bake for about 10 minutes.
Leave to cool on tray.