Have you heard of Starbucks Roastery locations? They showcase new varieties and new techniques with very expensive cups of coffee. This is the "siphon" technique, where the lower chamber gets sealed off and steam then pushes the water up. Then when removed from heat the vapor condenses and draws the coffee back down through the filter. It's essentially percolation but assisted by the vacuum created by the condensing water vapor. https://photos.app.goo.gl/FfFqTmUvwnbqrhDR7
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