You roast. We grind. Here are the numbers.

Burr Laboratory Brewery is a café we intend to open. We brew by hand, and we want a room where that can be shared.

Most coffee conversations are about beans. Origin, process, roast level, tasting notes. All of that matters, and we leave it to people who do it far better than we ever could.

We’re interested in something smaller: the burrs. The two pieces of steel that touch the bean first, and decide more than most people think about what ends up in the cup. Flat or conical. Eighty millimetres or eighty-three. How much fine dust a setting throws off, and what that does to clarity.

That’s where the name comes from. A burr laboratory is a slightly strange thing to build a café around, and we wanted the name to say so before anyone walks in. If you hear it and think “people who are oddly serious about grinder blades,” you’ve understood us.

Honestly, it started because we wanted a room to keep two grinders we love. Everything else grew from there.

We are experimentalists, not roasters. The first experiment is already set. One lot of beans, a flat burr and a conical burr, three grind settings each, three cups at every step. Everything else held still: the beans, the recipe, the water, the brewer. We measure the particle spread, the extraction, and the color, and we taste blind. What we hand back are relative numbers, not absolute ones, and we say so plainly.

We don’t tell roasters how to roast. Notes are yours. Numbers are ours. If you roast and want to know what your beans do under two different burrs, bring them in. That’s the conversation we’re hoping for.

The first opening has already happened, and it wasn’t in Tokyo.

On a Friday afternoon in October 2026, at three o’clock, we set up in the sixth-floor canteen of an office building in Berlin. A hand grinder from Taiwan, designed by a team of engineers. A grey resin dripper, also from Taiwan, with Hario paper filters. A plain German glass server, bought that week at a coffee shop three doors down from the hotel. Two coffees: XLIII Coffee, roasted in Da Nang, Vietnam, and The Barn, roasted right there in Berlin. Mrs. GREEN APPLE playing in the background. Guests were asked to bring their own mugs.

It lasted thirty-five minutes. Six people came, counting the ones who were only walking past: an Australian, an Italian, a Colombian, and a German. Twenty-two minutes in, an email arrived from one of them: “that was delicious!!” Day two is on Monday.

We also bought a beautiful hand grinder in Berlin that week, and left it at the hotel. The one from Taiwan is tougher, and we like that engineers made it.

There’s a joke we keep coming back to. One day the cup will turn out unusually clean, and someone will ask what the secret is. The honest answer will be that we just didn’t want the burrs to get dirty.

The permanent room will be in Tokyo, at A10 Design Studio. Small, a few seats, coffee brewed by hand, and the grinders out where you can see them. When the doors open, the details will be on this page.