Understanding what's really happening in your cup of coffee
You take a sip of coffee and you know right away whether you like it or not. But why? That's where it gets tricky. "Too acidic." "Too bitter." "I don't know, it's kind of... meh." That's not a lack of taste or talent: nobody ever really taught us how to connect what's happening in our mouth with the words to describe it. Good news: a few reference points are all you need, and we'll walk you through them with no jargon and no pop quiz at the end.
ACIDITY: WHAT MAKES A COFFEE LIVELY
Acidity is a good thing: it's what gives a coffee its freshness and character.
When a roaster talks about acidity, they don't mean chemical acidity. They're talking about a bright sensation that wakes up your mouth. It can remind you of the tang of a fruit, like a green apple or a lemon, and some coffees even bring to mind a sour candy, like Sour Patch Kids.
Here's the trick to spotting it: you notice it from the very first sip, then it fades fairly quickly. It's the bright, fresh side of coffee, the one that makes your mouth water. And as a bonus, it gives the other flavours a boost: it can make them taste more intense, or sweeter.
It comes mostly from where the bean was grown and how it was processed after the harvest. A coffee bean is the seed of a small red fruit, and there are different ways of separating it from that fruit (washed, natural, honey), which changes the taste. Acidity varies a lot from one coffee to the next. Some washed Kenyan coffees, for example, have a sharp acidity, with notes of citrus, lemon or berries. Others, like some washed Ethiopian coffees, are gently acidic, with notes of wild blueberry, jasmine and white flowers.
Acidity also depends on the roast, meaning how long the beans are cooked: the lighter the roast, the more the acidity comes through. That's the case with pale roasts, like many specialty coffees, which let the origin of the bean do the talking. On the Napoleon Rating Scale, that's why it shines in the Mellow range. It softens in the Medium range and almost disappears in the Dark range, where the longer roast wipes it out.
Don't mix them up: acidity and bitterness. They're two different sensations, and you don't feel them at the same time. One is bright and hits you from the very first sip. The other creeps in slowly and lingers at the finish.
BITTERNESS: NOT ALWAYS A BAD THING
Bitterness comes later. It settles in toward the end of the sip and sticks around long after you've swallowed. It's dry. Think of the finish of very dark chocolate.
Bitterness comes mostly from the roast: the longer the beans are roasted, the more pronounced it gets.
But careful: bitter doesn't mean bad. In a good coffee, we talk about "gentle bitterness": smoky, chocolatey, nutty notes, rich and intense. It's not unpleasant at all. Quite the opposite. The Dark range has the most of it. Medium is the happy middle: acidity, bitterness and body are in balance, and nothing takes over. If Mellow feels too bright and Dark too heavy, that's the range to try.
BODY: HOW IT FEELS IN YOUR MOUTH
Body isn't a flavour. It's the coffee's texture and weight in your mouth.
Think of milk. A Mellow coffee is light and fluid, like skim milk: it glides across your mouth and leaves little behind. A Medium is fuller and more enveloping, like 2% milk, but not thick. A Dark is rich and dense, like whole milk: it coats your mouth and lingers after each sip.
Body comes from the roast, along with the bean's origin and how it was processed. Brazilian coffees, for example, often have more body, as do naturally processed coffees and robustas, a different species of coffee plant from arabica. Neither good nor bad, it simply comes down to preference.
Here's the trick to spotting it: hold a sip in your mouth and let it roll across your tongue and palate. Does it feel fluid, like skim milk, or enveloping, like whole milk? You've just felt the body.
Good to know: acidity and body rarely go together. A washed Kenyan coffee, bright and tangy, slides across your mouth like juice, while a darker-roasted natural Brazilian coffee takes up all the room.
SWEETNESS: A GENTLE, NATURAL SWEET NOTE
Sweetness is a natural softness you notice without adding a single spoonful of sugar. It may bring caramel, honey or ripe fruit to mind, and it rounds off the sharp edges: when it's there, acidity and bitterness taste softer.
Here's the trick to spotting it: wait until the end of the sip. That's often when it appears, subtly, like a little reward.
FINISH: WHAT'S LEFT AFTER THE SIP
The finish is how long flavours linger in your mouth after you swallow. With a short finish, the coffee all but disappears. With a long one, it stays with you, tasting chocolatey, fruity or smoky, depending on the coffee.
A long finish isn't better or worse than a short one; it's a matter of taste. Here's how to gauge it: swallow, then count in your head. If the flavours are still there after a few seconds, the finish is long.
TASTING NOTES: WHAT MAKES EACH COFFEE UNIQUE
As with wine, whisky or chocolate, we use tasting notes to describe what we perceive: caramel, spices, citrus, hazelnut. That doesn't mean anything was added; those flavours come from the bean, its origin and its roast. A Mellow coffee lets the bean do the talking, with fruity, floral and lemony notes. A Dark leans toward smoky and cocoa notes. And even within the same range, no two coffees taste exactly alike: two Mellows can be very different from one another. That's what makes discovering them so much fun.
YOUR NEXT CUP
You have the words now. That doesn't mean you'll be able to name everything on your first try, and that's perfectly normal: it comes with practice, one cup at a time.
On your next sip, take a moment to pay attention.
Is there brightness at the start?
Bitterness settling in?
A texture that coats your mouth, a little sweetness, or flavours that linger?
You don't have to catch everything. Noticing just one thing is enough to get started.
At the end of the day, what matters is knowing what you like. There's no right or wrong answer, only what you taste and enjoy. And when you can say, "It's a bit too bitter, but I like the chocolatey side," we'll be able to point you to your coffee a whole lot faster.
To find your comfort zone, the Napoleon Rating Scale is there to guide you, from 15 to 85, from the most delicate to the heartiest.
Discover the Napoleon Rating Scale: cafenapoleon.com
IN PRACTICE: IF YOUR COFFEE SEEMS...
Too acidic? Try a Medium (65-70) or a Dark (75-85), where the brightness fades.
Too bitter? Try a Mellow (15-60) or a Medium, where the bitterness is more subtle.
Bland? Look for more brightness in a Mellow, or more texture in a Dark. And keep in mind that the freshness of the beans, the brewing method and the quality of the water matter too, as we explain in our 16 myths. > 16 Myths link