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Roast your own coffee

Roasting green coffee at home is easier than it looks, and it is the only way to drink coffee that is genuinely days-fresh. Green beans keep for many months; roasted beans do not. Tell it how you want to start and what roast you are after, and it will give you a method and a clear walkthrough.

Why roast at home. Green coffee is cheaper than roasted, stores for the better part of a year, and lets you roast small and often so every cup is fresh. The trade-off is a short learning curve and a bit of smoke — both very manageable.

The roast in five stages

Every roast, on every machine, moves through the same stages. Learning to hear and see them is the whole skill. First the beans dry, shedding moisture and smelling grassy. Then they yellow and brown as the sugars start to cook, smelling like toast or baking bread. Then comes first crack — an audible popping, like popcorn — which is where coffee becomes drinkable. The stretch after that is development, where flavour is built. Push further and you reach second crack, a quieter, faster crackle that marks dark-roast territory. Where you choose to stop is your roast level.

How much green coffee to buy

Coffee loses weight as it roasts — moisture and the papery chaff burn off — usually around 15 to 18 percent. So to end up with 200 grams of roasted coffee, start with roughly 240 grams of green. Buy more than you need anyway: unroasted green coffee stores well for many months in a cool, dry place, which is the whole point. Roast small batches often and you never drink a stale cup.

Rest before you brew

Fresh off the roaster, coffee is full of carbon dioxide and tastes sharp and uneven. Let it rest, in a container with a one-way valve or just loosely covered, for about 2 to 7 days before brewing — espresso often wants a little longer. If a roast tastes gassy or sour, it is probably just too young. The cup troubleshooter covers that and the other usual suspects.

A word on smoke and chaff

Roasting makes smoke, and more of it the darker you go. Roast near an open window, under a strong range hood, in a garage, or outdoors. The chaff — the papery skin that flakes off the beans — is light and a little flammable, so keep your roasting area clear and never walk away from a roast in progress.