What became of the Bulgarzoon?

 
Whither the Bulgarzoon?
Bulgaria? Kalamazoo? Mattoon?
Why vanished Zoolak, lackaday?
I do not see these offered at
Soda fountains of today.
Yesterday’s post on the new Lincoln Park Starfruit Cafe got me thinking about soured-milk drinks. Starfruit’s Twitter page describes it as “Chicago’s premier frozen kefir parlor,” which is funny, because Starfruit’s two locations are Chicago’s only frozen kefir parlors, [...]