Everything from pushing the coffee every which way with one's fingers, tapping the sides of the portafilter to lay the coffee flat, and even using a metal funnel that sits inside the portafilter whirling it the whole thing about like a helicopter. There are a variety of techniques for the even distribution of coffee in a portafilter. And even extraction leads to great tasting espresso. In short, distribution in important because even distribution leads to even extraction. Even though it looks flat and pretty, when hot water gets forced through it more water will move through the less dense places and less water will move through the more dense places, yielding a shot that's a mish-mash of under-extracted and over-extracted flavors. It's more important than exact tamping pressure, and possibly even more important than tamping levelly! If one fails to distribute evenly, the coffee will be pressed down in such a way as to create a puck of varying density. Distribution is very, very important to the success of a shot of espresso.
In order to make a great shot of espresso, one must spread out that uneven hill of freshly ground coffee into an evenly distributed bed of coffee that will then get tamped flat. Distribution is what must happen after coffee has been ground and dosed into a portafilter. In order to fully appreciate what the OCD does, you'll need to appreciate the importance and difficulty of distribution for espresso. It's a super-simple, fast, and easily-repeatable process for amazingly good coffee distribution. The OCD creates an even, flat bed of espresso to tamp on by being placed onto an undistributed dose of espresso in a portafilter, resting on the sides of the filter basket to flatten the device, and spinning it three times.
The ONA Coffee Distributor (or OCD) is a tool initially conceived of in 2012 and created by Sasa Sestic, the 2015 World Barista Champion.
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