One small error in its preparation and it's undrinkable.
If you do everything correctly with the right timing then it's almost drinkable. On the plus side you can read your future in the grounds after the coffee has been drunk.
What future did you read from your remains, Anon?
keep it boiling at the lowest possible temperature
take it off as soon as the first bubble pops
Funny thing about it, in Greece it was renamed to "Greek coffee" because they got butthurt after "certain events".