Clean & trim & hull the strawberries.
Clean the raspberries.
Purée the strawberries w/ 2 tbsp of the orange liqueur in a stand mixer.
Do the very same w/ the raspberries; afterwards strain the raspberries. Discard the pits.
Pour all the purée in a bowl & whisk.
Add the condensed milk as well as the Greek yoghurt & mix.
Pour the mess in a container & put it in the freezer.
Every 2 hours just whisk the mess once again.
After about 6 h the ice cream is ready.