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It's for cold drink https://okusno.je/domace/zdaj-je-cas-da-si-naredite-bezgov-sok.html put recipe into google translate :)

Very interesting!

What does it taste like?

Like elderflower 😁, I'm sure you can buy juice, malt, or syrup in your stores, too. We call it
"šabesa" or "boza" in Serbian or Croatian language. It's very popular here as home-made syrup.