@AMiracle a friend just told me about it at a cage in Bristol, PA. Unfortunately that's 300 miles away. And I won't be there till July.

@butch how do they do that without the lemon curdling the milk?

@anatman I'm still working on that part. The blueberry is probably a syrup, so the Lemon bit probably is too.

OK, I'm starting here. Just waiting for the syrup to finish cooking and then cool:
https://www.driscolls.com/recipes/blueberry-lemon-syrup

Then it's gonna be blueberry lemon latte time.