First things first, this is Turkish tea, as it is drunk, on the left. It is always served in a tulip-shaped tea glass, but nobody seem to know the history of this tradition.
The tea shown on the left is obtained by partially filling the glass with a small portion of a very, very strong amount of the tea that has been steeping for at least 30 minutes:
But how do you steep tea for so long and still keep it warm? Here is the secret, my new Bosch Turkish tea cooker:
And here you can see it in action. The top glass kettle is made to hold a large portion of tea and let it steep for a long time at temperature, because it sits directly over a heated amount of hot, pure water below, that is then used for diluting the tea to the desired strength in the tulip-shaped tea glass: