Welcome back: let's read a coffee bag
Last time we followed coffee from cherry to cup and met arabica and robusta. Now pick up any bag of coffee from a decent roaster. You'll see words like Ethiopia, washed, natural, light roast. What do they actually mean for your cup?
Quite a lot, as it turns out. Three things on that label do most of the work: where it grew, how the cherry was processed, and how dark it was roasted. Let's go through them one at a time.
Origin: where the coffee grew
Think of coffee a bit like wine or apples. The same kind of plant tastes different depending on the soil, the climate and, above all, the altitude.
Why does altitude matter so much? Higher up, it's cooler, so the cherries ripen more slowly. Slow ripening tends to give denser beans with brighter, more complex acidity. Lower-grown coffee usually tastes fuller and softer, with less acidity.
Here are a few origins you'll often see on bags:
- Ethiopia: often floral and fruity, with tasting notes like blueberry, jasmine or bergamot.
- Kenya: bold and juicy, with berry-like acidity, often described as blackcurrant.
- Brazil: often grown at lower altitudes, so you get chocolatey, nutty coffee with low acidity.
- Sumatra (Indonesia): earthy, herbal and heavy-bodied, partly because of a local processing method called wet-hulling.
These are broad tendencies, not rules. Still, they give you a really useful first guess.
Processing: what happens to the cherry
Remember that a coffee bean is the seed inside a fruit? Between the skin and the seed there's a sticky, sugary layer called mucilage. After harvest, the farmer has to get the seed out and dry it. How they deal with all that fruit is called processing. It shapes flavour just as much as the roast does.
Washed. The skin and fruit come off early, the mucilage is removed, and only then is the bean dried. Less fruit contact means a clean, crisp, clear-tasting cup where the origin's own character shines through.
Natural. Here the whole cherry is dried intact, fruit and all, and the dried fruit is stripped off afterwards. All that time sitting in the fruit sugars gives sweeter, fruitier and sometimes "funky" or wine-like flavours. Think berries and jam.
Honey. This sits in between. The skin comes off, as with washed coffee, but some or all of the sticky mucilage is left on during drying, as with a natural. And no, there's no honey involved! The name comes from that sticky, honey-like layer. You'll get a cup that's sweeter and rounder than washed, but cleaner than natural. You might even see "yellow", "red" or "black" honey on a label. Those names roughly reflect how much mucilage was left on and how the beans were dried.
So here's a quick question for you. A bag says Ethiopia, natural. What would you expect? Fruity, probably berry-like, and quite sweet. Spot on.
Roast level: light, medium, dark
Roasting is where green, grassy-smelling beans become the brown coffee you know. As the beans heat up, they pop audibly, a bit like popcorn. Roasters call this the first crack. Keep going and you reach a quieter, snappier second crack, where oils start rising to the surface.
Light roasts are stopped shortly after first crack. They keep more of the bean's origin flavour and taste brighter and more acidic, often fruity or floral.
Medium roasts go past first crack but stop before second. They're more balanced, with rounder acidity and nutty, caramel notes.
Dark roasts go to second crack or beyond. Here's the trade-off: the darker the roast, the less acidity you taste and the more bitterness and "roasty" flavour you get, like dark chocolate, smoke or toast. The beans often look shiny and oily too.
Here's a handy way to picture it. Roasting is like toasting bread. Lightly toasted, you still taste the bread itself. Take it very dark and mostly you taste the toast.
Your tasting experiment: light versus dark
Now let's put this to the test. Get a small bag of light roast and a small bag of dark roast. If you can, pick ones from the same roaster.
Brew them exactly the same way: same method, same amount of coffee, same amount of water. That way the roast is the only thing that changes. Let both cool a little, because flavours show up more clearly when the coffee is warm rather than scalding.
Take a sip of each, back and forth, and ask yourself three questions:
- Acidity: which one feels brighter or juicier on your tongue, a bit like biting an apple?
- Sweetness: can you pick out fruit, caramel or chocolate in either?
- Bitterness: which one leaves a stronger bitter, smoky finish?
You'll probably find the light roast brighter and fruitier and the dark one heavier and more bitter. Jot down a word or two for each. Don't worry about getting it "right", because you're training your palate.
Key takeaways
- A coffee label usually tells you origin, process and roast level. Together they predict a lot about flavour.
- Higher altitude tends to mean brighter acidity. Lower altitude tends to mean fuller, softer coffee.
- Washed tastes clean, natural tastes fruity and sweet, and honey sits in between (and contains no honey).
- Light roasts are brighter and show more origin. Dark roasts are less acidic, more bitter and roasty.
- When you compare, change only one thing at a time.