The Best Way to Reheat Coffee (and When Not To)
Reheating coffee sounds simple until you do it to the same cup twice and notice the difference. The first sip tastes fine, maybe even better if you let it warm slightly. The second time around, the cup can turn flat, bitter, or strangely thin, like someone poured hot water through used grounds. That change is not just in your imagination. Coffee is a delicate mix of volatile aromatics, oils, acids, and suspended solids that behave differently as heat and time do coffee se