I read somewhere once that a simple check with underextracted espresso was to taste / test the same roast as a drip coffee.
If this also underextracts than the problem is likely to be with underdeveloped roasts and not some other problem.
I'll look up and try to find the source.
If this also underextracts than the problem is likely to be with underdeveloped roasts and not some other problem.
I'll look up and try to find the source.

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