If you have a blender with an ice-crushing function, you can put the frozen fruit in the blender straight away and puree it to a greater or lesser extent (as you like).
If you don`t have an ice crush mixer, let the frozen berries thaw for about 30 minutes until they are a little soft (the following step also applies to fresh fruit), then you can puree the berries. Then add the milk, if you like it sweeter, a little more honey. Then mix everything.
Best served ice cold and garnished fresh with fruit.