Add Yahoo as a preferred source to see more of our stories on Google. We used a Kruve coffee sieve system to confirm grind size consistency. Want the best-tasting coffee for your morning brew?

Pair a $5,000 chromed-out Italian espresso machine with old or poorly ground coffee, and your ristretto will taste mediocre — or worse, like a cup of salty battery acid. But invest in a good manual ...

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