Learned about cold-brew coffee sometime ago, but this Black Blood of the Earth stuff . . . whoa. Keanu Reeves moment just reading about it. It’s beyond most small-scale tech dealing with coffee caffeine:
By my calculations, I produced the equivalent of 145 cups of conventional coffee’s worth of caffeine in 5.7 cups of volume
Too bad the creator of BBotE only produces about 12 liters per week at the moment.