A new study flips the traditional technique on its head.
A group of researchers wondered whether the traditional method of using high quantities of very finely ground coffee would indeed produce a primo beverage.Here’s some tiresome news for coffee-enthusiasts everywhere: Your morning cup of joe might not be as invigorating as you thought. The conventional coffee-brewing technique—grinding large amounts of beans as finely as possible—may actually deliver an inferior beverage, and waste grounds in the process.
To calculate the transfer of mass from solid to liquid—that’s what happens when hot liquid combines with coffee grounds to create the signature beverage—scientists turned to battery modeling methodologies. They likened the movement of lithium ions through a battery’s electrodes to molecules like caffeine dissolving out of coffee grounds. Ultimately, the team chose to specifically analyze espresso-style coffee because the drink’s small size tends to magnify any brewing errors.
Though you’d expect finely ground beans to wet evenly within machines, some regions get more drenched than others; as a result, over-extracted areas produce bitter flavors and under-extracted ones add sourness. So with this method, it’s hard to get consistent espresso flavor and a high brewing ratio.
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