The perfect espresso will be covered with a rich crimson Klima (the dark brown foam on the coffee surface, containing the key aroma molecules in the coffee).
A good espresso will leave a rich aroma in the cup after drinking.
Observe the extent to which Klima "hangs the cup" (left on the wall of the cup). Many hanging cups are good espresso. In foreign countries, you can refuse to pay for hanging cups.
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