French Press Brewing Tip – Leave You Lid Off
Matt Perger from the Barista Hustle noticed something strange while putting together his Immersion Brewing course. When brewing coffee in a French Press the lid was left off during the brew, it seemed to increase the extraction significantly. This is not what we would expect. Leaving the lid on the French Press should keep the water hot longer, which would increase the extraction. We recommend that you leave the French Press lid off at least until the crust has broken. This will maximize extraction. This effect was already observed in previous experiments to determine the best time for breaking the crust during cupping. To ensure that cupping did not depend on the crust insulating its surface, we covered the cupping cups with polystyrene covers. We found that the extraction rate was lower the longer the polystyrene lid was left on. The longer the cupping bowl is covered, the less extraction … Read More