As others already said, this article really confuses "cold brew" and "iced coffee".

Friends of mine have a roastery in Berlin and for "cold brew" the coffee extraction process takes a long time:

> Basically, cold water is used in a Cold Brew for extraction, that is heat is replaced by time.

Full step by step recipe is at https://www.flyingroasters.de/blog/cold-brew-rezept/ (German only, Google Translator: https://translate.google.de/translate?hl=de&sl=de&tl=en&u=ht...)

I personally like it very much with Tonic water. Especially in summer. Everybody who also likes Gin Tonic should try a Cold Brew with Tonic.

If you happen to live in Berlin and want to try one without much hassle, they have a booth at the next Weddingmarkt on 3 July. Highly recommended.