How to make
Put the berries, ice, sugar, yoghurt and milk in a blender and blend everything at maximum power for about 25 seconds.
If your blender is not suitable for grinding ice, then crush it separately in a way convenient for you.
Transfer the mixture into a shaker (the ice along with it, if you have broken it separately) and blend once more.
Distribute the mixture into tall frappe cups and serve them immediately.