Brew Method
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If you make coffee with an electric coffeemaker, you are leaving a fair amount of caffeine in the bean. The same goes for the pour-over method, which is similar to a coffeemaker for caffeine content. If you're looking for a bit more of a punch – not to mention a nice rich mouthfeel – the French Press is the way to get it. Grounds spend longer in a French Press than in most other brew methods, so the caffeine content increases.