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My attempt at a 'cold brew concentrate' turned into a science experiment
I saw a video about making a super strong cold brew by using a 1:4 coffee to water ratio and letting it sit for 24 hours. I used my whole bag of Ethiopian beans, ground them coarse, and put the jar in the fridge. When I opened it, the brew had fermented so much it fizzed and smelled like vinegar. I learned that my warm kitchen probably started the process before it even got cold. Has anyone else had a batch go fizzy like that?
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