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When you read what I did yesterday, you might want to ask me: Are you f---ing nuts? Believe me, I asked myself that question more than once. What did I do? I’m almost ashamed to admit it, but I spent $9 on a cup of coffee (12oz). No, that’s not a misprint. I promised a reader (Jake) that I would write about the vacuum pot, or siphon method of brewing coffee. I knew that Barista in the Pearl District had them, so I went there on a mission—seek out a vacuum pot and report on its mysterious powers. Then I got there and saw the price. It almost made me cry, but I had made a promise. . .
What is so special about the siphon brewing method? Well, for one thing, it’s great coffee theater. A vacuum pot looks cool—almost space-aged, even though it has been around for nearly 150 years! You don’t see them in use very much, so when you do get to see one it is worth watching. I stood there captivated as the barista prepared my precious coffee, an Ethiopia Sidama from Intelligentsia.
This is how the siphon method works: First, the barista measures out the correct amount of water into the lower bulb of the vacuum pot. The bulb is then placed over a heat source. It could be a flame or a hot plate, but at Barista, they have specially-designed heat lamps that heat the water (it looks cooler that way). While the water is heating, the barista then measures out and grinds the proper amount of coffee, setting it aside until the water is ready.
Warming up
When the water begins to boil, steam travels up a tube, condensing back into water as it travels upward. When it reaches the bowl on top, the water is about 202 F, just the right temperature for coffee extraction. When nearly all the water has reached the bowl, the barista adds the ground coffee and stirs it, making sure that the all of the grounds are in contact with the water. While the extraction is taking place, the small amount of water in the bottom bulb continues to rise into the extraction chamber, helping maintain a constant temperature. The coffee is allowed to brew for two to four minutes, depending on the grind.
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