Most dark roast is roasted in a drum, where the beans tumble against hot metal. Heat moves from the outside in, so the surface is always running ahead of the core. Push it far enough to get the dark color and the outside starts to char before the middle has finished.

You end up with a bean that looks fully roasted and isn't. The scorched outside is where the burnt, ashy bitterness comes from. The underdeveloped middle is where the sharp, sour acidity comes from, the kind a lot of people tell us they feel an hour later. Dark on the outside, unfinished on the inside, and both of those in the same cup.

There's a second thing going on. Every bean sheds a papery skin as it roasts, and in a drum that chaff has nowhere to go. It burns alongside the coffee and settles back onto it.

That's the taste people have been told is bold. It's why so many reach for milk without ever deciding to.

Drum roasting is how most of the world's coffee gets made, and plenty of people do it well. It's a real craft and we've got no quarrel with it. We just went a different way, because we wanted the dark without the scorch.

Our Sivetz fluid-bed roaster floats every bean on a current of hot air. Nothing touches a hot surface, so the outside never gets a chance to char. That's the dark without the burn.

Air reaches the whole bean at once, so the core finishes with the surface instead of lagging behind it. No burnt edge, no raw center. Just one color from the outside in.

Coffee is a crop, and crops can pick up mold between the farm and the bag. Most roasters never look. We test, because we won't hand our kids something we haven't checked.

Full bodied, dark chocolate up front, cardamom and clove underneath. The spice holds as the pot cools. Smooth finish, no bite. This is what dark roast is supposed to taste like.

Thick crema and a shot with some spice to it. It pulls sweet rather than sharp, and it holds its own under milk without turning into ash. Espresso that still tastes like coffee.