Which coffee beans for your espresso machine? Whole beans, medium to medium-dark roasted, and roasted within the past few weeks. Those three together do more for your cup than the origin on the bag or the brand of your machine. An espresso machine pushes hot water under high pressure through a compact bed of coffee, and that process reacts strongly to freshness and grind. So that is where it starts.
Whole beans, because the grind is your control
Espresso asks for a fine grind, and finely ground coffee gives up most of its aroma within a quarter of an hour. So grind just before brewing. More importantly: the grind is the setting with which you really steer a shot. If your espresso runs through in ten seconds, grind a little finer. If it takes almost a minute, go slightly coarser. With pre-ground coffee you do not have that control.
Medium to medium-dark gives you the most room
Lightly roasted beans come into their own on a machine where you can steer temperature and pressure, with a grinder that adjusts very precisely. Wonderful if you have all that standing there. In most kitchens a medium to medium-dark roast behaves more predictably. Those beans dissolve more easily, give crema readily and hold their character in milk, so also in a cappuccino or flat white. If you have a bean-to-cup machine, choose beans with a dry, matte surface. Those run smoothly through the grinder.
The ratio to start with
A common double espresso is 18 grams of coffee in the basket and around 36 grams of espresso in the cup, in 25 to 30 seconds. That 1 to 2 ratio counts as the starting point in specialty coffee. Weigh what comes out rather than looking at how full the cup is, because crema takes up a lot of space and weighs almost nothing. If it tastes sharp and thin, let it run a little longer. If it tastes heavy and bitter, stop earlier.
Give fresh beans a week or two
Freshly roasted beans still release carbon dioxide. Under the high pressure of an espresso machine you notice that straight away: the shot fizzes, and the run time jumps around from one go to the next. For espresso the sweet spot sits somewhere between seven and fourteen days after roasting. So look at the roast date on the bag. That tells you far more than a best-before date somewhere far in the future.
What matters less than people think
Honestly, the exact origin is a side issue for most home machines. A bean from Brazil or from Sri Lanka can both work excellently. A more expensive bag also delivers little extra as long as your grinder is not keeping up. Anyone wanting to improve their cup usually gains most from a good grinder, a small scale and fresh beans. Only after that does the choice between two lovely coffees become genuinely audible.
Looking for a bag to start with: our Espresso Beans are medium-dark roasted, here in Amersfoort, and meant for exactly this kind of machine. A 250 gram bag costs 10.95 euro and is enough for around fourteen double shots. If you mostly brew filter coffee, a lighter, softer roast is a more logical starting point.
Beyond that it does not have to be complicated. Fresh beans, ground just before brewing, a ratio you stick to, and then simply taste what is in the cup. Just good, every morning again.