But, I had had it cold, when I generally drink hot coffee. Does it taste similar, but better, than hot coffee when cold brewed coffee is heated?
Also, how do you heat it? I'm assuming microwave is the best option..
Curious before trying it again :)
I drank it like whisk[e]y - in a similar glass and on ice (okay okay, ice and whiskey may not be a valid combination for everybody, but let's not get distracted, I used the image only for illustration). It was much more concentrated than normal coffee, and it tasted great! Very different from usual coffee and espresso. It also was a perfect drink during those hot summer weeks. I deeply regretted the apparent incompatibility of the commercial needs of the shop with this drink.
Going by the taste I experienced, and since they are a small roaster they always have new types of beans so I had several very different ones, I see no reason to heat this even if you don't drink it in a hot summer.
EDIT: [German] Looks like they sell it in bottles prepared in batches from their main store now, instead of day (night) in small daily batches: https://www.facebook.com/roesttrommel/photos/a.1510286749418... -- They write "Schmeckt am besten eisgekühlt." which translates to "Tastes best ice cold."