Purge Before You Trust the Next Shot
Decide when to purge retained grounds after changing espresso grind size.
One adjustment has just been made. Rae turned the grinder finer after a fast shot. What should happen before she judges the next espresso? Purge retained grounds, weigh the dose again, then pull the next shot at the same target yield. Correct. The purge clears mixed old/new grounds, and re-weighing protects the dose after the grinder setting changes. Pull the very next dose without purging because the grinder changed immediately. Weaker. Grinder retention means the next dose may contain grounds from the previous setting, so the result can mislead you. Turn the grinder finer again if the first post-change shot…
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