The issue of pouring water for pour-over coffee is a well-worn topic, but many friends who have just started following Front Street Coffee say, "Why can't I brew a good cup?" "Pour-over coffee is so hard!" Pour-over coffee is still a relatively niche circle, and to accommodate new friends, repeating well-worn topics is unavoidable.
For friends who are just learning to brew coffee, Front Street Coffee believes that understanding and using the correct brewing parameters is more important than pouring techniques. (That's why Front Street Coffee often mentions parameters.) Front Street Coffee believes that for brewing a delicious cup of coffee, there are countless parameters, but for beginners, a highly compatible parameter set is the most suitable. So you may see that Front Street Coffee recommends almost identical brewing parameters for most coffee beans (with a few exceptions). This is not Front Street Coffee being lazy or pulling your leg, but rather that highly compatible, simple methods are suitable for widespread adoption. (Front Street Coffee has also made a series sharing brewing techniques.)
I've digressed, let's get to the point.
First, we see that the vast majority of coffee shops brew coffee by pouring water in a circular motion. Correspondingly, some adopt center pouring. Now Front Street Coffee will demonstrate center pouring and circular stirring to observe the changes in the coffee bed.
It can be seen that with center circular pouring, turbulence is extremely likely to occur. With the slightest angle in the water stream, the water's movement within the coffee becomes uncontrollable. As shown in the video, after the water stream hits the bottom of the coffee, it flows back in the direction of pouring. This easily forms channels, and the water all flows away through those channels. Observing the coffee wall with center pouring, one side is thin and the other is thick. With circular stirring pouring, this doesn't happen—the coffee wall has a uniform thickness.
So from this comparison, we can see that stirring while pouring, on one hand, is less prone to causing turbulence, and on the other hand, provides even extraction.Actually, "stirring" has always existed in the little details of our lives. When dissolving "granules," we use a spoon to stir so the granules fully dissolve in the water. The stirring from pouring in pour-over coffee serves a similar purpose—it lets the water flow act as a stirring tool, continuously "stirring and tumbling" the coffee bed, allowing the coffee grounds to release more flavor compounds.This raises a question: is stronger stirring always better? The answer, of course, is no. We only want the delicious compounds from the coffee, not bitter or off-flavors. When stirring is too vigorous, even after you stop pouring, the water surface will still continue rotating in the stirring direction, like a drum washing machine (the faster it spins, the more easily water is thrown out), and the coffee is also prone to producing unpleasant flavors.
Also, one thing to note with pour-over pouring is to try not to pour onto the filter paper. Breaking through the coffee wall easily forms channels and causes incomplete extraction. Front Street Coffee suggests that friends just learning pour-over should start with slow (circular pouring), steady (water flow), and straight (water stream) when pouring in circles.
There are two more questions about pouring: what should the pouring height be? And should you pour clockwise or counterclockwise?There is no standard for these two questions. Some people like to pour close to the water surface, while others like to raise the water stream higher. The difference between these two is the change in water temperature—pouring from a high position makes the water stream lose temperature easily (at about 8cm height, the error is roughly 0.7-1 degree). But Front Street Coffee also doesn't recommend pouring close to the water surface, because many kettles have a certain angle when pouring, and you need to raise to 2-3cm for it to be vertical. Pouring close to the water surface easily causes turbulence or breaking through the coffee wall.
As for clockwise or counterclockwise pouring, Front Street Coffee's answer is: either is fine, as long as you keep circling in the same direction from beginning to end. Of course, there are online discussions about the difference between clockwise and counterclockwise pouring based on the spiral direction of the V60 filter's ribs. Front Street Coffee thinks this is a good topic for after-dinner chat.
The above content is compiled by CoffeeHunters, a coffee news website.
