Instructions: In response to your request for "buttermilk milkshakes": I have never seen them out at a restaurant, but have made them at home. It may be too simple, and it may not be what your friend had in Canada, but heres how Ive made them:
Blend in blender until thick, but not too long or fruit will thaw too much.

Add a few ice cubes if this happens. You can also use any kind of milk as well.

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