Every experienced barista worth their salt knows that pulling a perfect shot of espresso is extremely difficult to do on a consistent basis. Try as one might to repeat every step that went into pulling a perfect shot, inevitably the next shot just is good, in fact very good, but just not as good as the one a minute ago. And then we try to reproduce that perfection.
There are many factors that go into why some shots are better than others - perhaps the equipment or ambient temperature or humidity changes imperceptably in the last minute... maybe it was an imprecise tamp because of an inconsistent grind... perhaps a half-second difference in the brew time... or a half degree off the desired boiler temperature... a hair off the ideal water pressure... or a couple of lesser beans in the hopper just dragged down the rest.
Espresso equipment is fussy and people not robots, so even under the best conditions, repeating the steps that go into a perfect shot is extremely difficult.
That's why baristas call those rare perfect shots "GodShots".





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