Shakerato or Iced Coffee Look

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A couple of years ago my wife and I were having a shakerato or iced coffee in Verona, Italy.
I didn't find out how they made it. Anyone have any ideas?
In particular I'm interested in how they got that "fish scale" look.

 

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it certainly looks like nitro coffee brew...

View attachment 8963

Thanks, I think that's it!