Washed
Pulp off, ferment 12–72 h in tanks, wash, dry the seed. All the fruit comes off first, so you taste the seed and its place. Crisp acidity, florals, tea.
A field guide to specialty coffee
Coffee is a fruit.
Every cup begins as the seed of a red cherry. Scroll to follow one from a mountainside to your mug.
Before we start
The jar and the bag are different drinks.
Freshness2 years2 weeks
GradedNo80+ pts
Tastes of“coffee”jasmine, berries
Per cup$0.10$1
Field notes what's actually different
- Instant
- Coffee brewed in a factory, then freeze-dried or spray-dried into crystals. Mostly Robusta, chosen for yield and price. The label gives a brand and “rich aroma”, with a best-before date up to two years away.
- Specialty
- Whole seeds you grind and brew yourself. Mostly Arabica, scored 80+ out of 100 by trained tasters, with zero primary defects allowed in a 350 g sample. The label names the region, farm, altitude, variety, process and roast date.
- Cost
- 15 g from an $18, 250 g bag is about $1 a cup at home. A café charges $4–6 for the same thing.
Instant isn't a crime. It's fast and consistent. But it relates to fresh coffee the way juice from concentrate relates to an orange you just peeled.
01 The plant
It begins as a flower.
White blossoms that smell of jasmine for three days. Seven to nine months later, a red cherry with two seeds inside.
2species feed almost the whole world
3–4years before a new tree gives a real harvest
~1 kgof green coffee per tree per year, about three bags
Field notes Arabica vs Robusta, and varieties
Coffea arabica · ~60% of production
Arabica
From the forests of southwest Ethiopia. Fragile, low-yielding, loves altitude and cool nights. Sweeter, more acidic, far more complex.
- Grows at
- ~1,000–2,300 m
- Caffeine
- ~1.2–1.5%
- Sugars
- Roughly double Robusta's
- Tastes
- Fruit, florals, caramel
Coffea canephora · ~40% of production
Robusta
Hardy and high-yielding. Its extra caffeine is a natural insecticide. The backbone of instant and many espresso blends; “fine Robusta” is a growing niche.
- Grows at
- Sea level to ~800 m
- Caffeine
- ~2.2–2.7%
- Sugars
- Lower, so more bitter
- Tastes
- Woody, cocoa, heavy body
Gesha / GeishaNamed after the Gori Gesha forest in Ethiopia, not Japan. Jasmine, bergamot, peach. Has sold for over $1,000 per pound at auction.
BourbonFrom Réunion (once Île Bourbon). Sweet, round, caramel-like.
TypicaOne of the oldest cultivated lines. Clean and sweet.
SL28 & SL34Bred in 1930s Kenya. Blackcurrant, grapefruit, juicy acidity.
Caturra & CatuaíCompact mutations planted across Latin America. Bright and dependable.
Ethiopian landracesThousands of wild and semi-wild types, often labelled “heirloom”. The source of the florals.
02 Origin
Born between the tropics.
Coffee grows in a belt around the equator, in more than 70 countries. The higher it grows, the slower it ripens, and the more flavor it packs in.
03 Harvest & process
Six layers guard two seeds.
Skin, fruit, sticky mucilage, a papery husk, a silver film, then the seed. How the farmer strips them away changes the flavor as much as where it grew.
Washedclean, bright
Honeysweet, round
Naturaljammy, berry
Anaerobicwild, tropical
Field notes the anatomy, and each process step by step
Pickers pass the same trees several times a season, taking only ripe red cherries. It takes roughly 5–6 kg of cherry to make 1 kg of green coffee, dried to about 11% moisture.
Natural
The whole cherry dries in the sun for 3–6 weeks, then the husk comes off. The seed soaks up fruit sugars: jammy, winey, berries, heavy body.
Honey
Skin off, then dried with the sticky mucilage left on. Not made with honey; the name is about the stickiness. Rounder and sweeter than washed.
Anaerobic
Fermented in sealed tanks without oxygen, borrowed from winemaking. Intense, boozy, tropical: cinnamon, rum, passion fruit.
Also: wet-hulled (giling basah), the Indonesian method behind Sumatra's earthy, cedar character.
04 Roast · keep scrolling
Twelve minutes of fire.
25°C
Drying
Green coffee
Hard as a pebble and smells like grass.
Time 0:00Weight lost 0%Agtron —
Field notes light, medium, dark, and what the reactions do
Sugars and amino acids react (the Maillard reaction, which also browns bread and steak), sugars caramelize, water turns to steam, and the bean cracks audibly like popcorn. It loses 12–20% of its weight and swells by half.
Light
Pulled soon after first crack. The most origin character: fruit, florals, bright acidity. Loved for pour-over.
Medium
Balanced. Caramel sweetness peaks and body grows. The easiest place to start, and the sweet spot for many espressos.
Dark
Into second crack and beyond. Oils rise; smoke and bittersweet chocolate take over. What most people think coffee tastes like.
05 Rest & freshness
Coffee is still breathing.
Roasted beans breathe out carbon dioxide for days. That's why fresh coffee blooms when water hits it, and why bags have a valve.
4–30days after roasting: the sweet spot
Minutesis how fast ground coffee starts to fade
1 habitgrind right before you brew
Field notes the freshness curve, and how to store beans
Do
- Buy whole beans with a roast date.
- Buy what you'll use in 2–4 weeks.
- Store airtight, opaque, at room temperature.
- Freeze extras in sealed portions; grind from frozen.
Don't
- Keep an open bag in the fridge.
- Store coffee in a clear jar in the sun.
- Trust a best-before date with no roast date.
- Buy pre-ground if you can avoid it.
06 Grind
The grinder matters more than the machine.
Even particles extract evenly. A blade grinder makes dust and boulders at once, so you taste sour and bitter in the same cup. Buy a burr grinder.
07 Water
98.6% water.
Every dot in that drop is water, except the copper ones: the 1.4% that is coffee. If your tap tastes of chlorine, so will your cup.
90–96°Celsius. Boil, then wait about 30 seconds.
150mg/L of minerals: the SCA's target
Filterednot distilled, not hard
Field notes why minerals matter
Magnesium and calcium help pull flavor out. Too few (distilled water) and coffee tastes flat and sour; too many (hard water) and it turns chalky while scale clogs your machine. Alkalinity buffers acidity: a little rounds off harshness, too much flattens everything.
Total minerals75–250 mg/L
Calcium hardness50–175 ppm
Alkalinity≈ 40 ppm
pH≈ 7
08 Brew
Brew Lab
Water can dissolve about 30% of a roasted bean. You want 18–22%: acids first, then sugars, then bitterness. That's extraction. How concentrated the cup is, strength, is the other dial. Move the sliders and see where your cup lands.
Brew ratio1:16.7
Your cup
Dialed in
Extraction20.0%
Strength1.33%
Brew time3:00
In the cup220 g
A teaching model based on typical behaviour, not a lab instrument. Targets follow the SCA's classic brewing control chart.
08 Methods
Six ways in.
Soak it (French press, AeroPress, cold brew) for body and forgiveness. Pour through it (pour-over, espresso, moka) for clarity and control. Weigh everything.
Field notes rituals from around the world
EthiopiaJebena bunaPan-roasted in front of guests, boiled in clay, served in three rounds.
Turkey · Middle EastCezveFlour-fine coffee heated slowly until it foams. UNESCO-listed heritage.
VietnamCà phê phinA metal drip filter over condensed milk. Pour over ice for cà phê sữa đá.
South IndiaFilter kaapiA steel drip decoction with boiled milk, poured between tumbler and dabarah.
CubaCafecitoMoka espresso whipped with sugar into a pale foam, shared in tiny cups.
09 Espresso & milk
Nine bars of pressure.
18 g in, 36 g out, 25–30 seconds, at the pressure you'd feel 90 meters under the sea. Nearly every drink on the menu is that shot plus water, milk or foam.
Field notes steaming milk that tastes sweet
- Purge and start cold. Clear the wand. Fill a cold jug to the base of the spout.
- Stretch. Tip just under the surface for a soft “tearing paper” sound, until the jug is lukewarm.
- Spin. Sink the tip a little, off-center, so the milk whirlpools into microfoam.
- Stop at 55–65°C. Too hot to hold for more than a second. Swirl until it shines like wet paint.
10 Taste
Nobody adds the blueberries.
Tasting notes are comparisons. The coffee shares aromatic compounds with the fruit, and your nose, not your tongue, does most of the tasting.
Acidity bright or sour?Sweetness sugar without sugarBody tea or cream?Bitterness cocoa or ash?Finish what lingers
Field notes how to read a bag of coffee
Example Roasting Co. · sample
Yirgacheffe
1Jasmine · bergamot · lemon curd
Illustrative example, not a real product
- 2Origin
- Gedeo zone, Ethiopia
- 3Altitude
- 1,900–2,100 masl
- 4Variety
- Ethiopian landraces
- 5Process
- Washed
- 6Roasted
- 12 Sep · light
- 1Tasting notes. Fruit and florals mean bright; chocolate and nuts mean comforting.
- 2Origin. A region beats a country; a farm beats a region.
- 3Altitude. Over ~1,500 m usually means denser beans and livelier acidity.
- 4Variety. The grape of coffee. Gesha and SL28 lean floral and fruity.
- 5Process. Washed is clean, natural is fruity, honey is sweet, anaerobic is wild.
- 6Roast date. The most important line on the bag.
Unlearn
Things everyone gets wrong.
Tap a card to flip it.
Start here
Spend in this order.
- Fresh beansfrom a roaster, with a roast date
- Burr grinderhand grinders start around $50
- Scale0.1 g precision, ~$20
- Watera filter jug
- Brewera $10 cone is enough
Curious~$100
Hand burr grinder, pour-over cone or AeroPress, scale, fresh beans. Better than most cafés after a week of practice.
Hooked~$400
Electric burr grinder, temperature-control gooseneck kettle, a second brewer, and beans from several origins to compare.
Espresso~$600+
An espresso-capable grinder matters more than the machine. Swap pressurized baskets for standard ones once you can grind fine.
Field notes what's wrong with my cup?
| It tastes… | Probably | Try, one change at a time |
|---|---|---|
| Sour, sharp, thin | Under-extracted | Grind finer, hotter water, brew longer. |
| Bitter, dry, hollow | Over-extracted | Grind coarser, slightly cooler water, shorter brew. |
| Sour and bitter at once | Uneven extraction | Burr grinder; stir the bloom; for espresso, WDT and a level tamp. |
| Watery | Too little coffee | Try 1:15 instead of 1:17. |
| Heavy, muddy | Too strong | More water for the same coffee. |
| Flat, papery | Stale beans or water | Check the roast date, rinse paper filters, filter your water. |
| Espresso gushes in 10 s | Grind too coarse | Finer in small steps. Pressurized baskets hide this. |
| Espresso drips for 50 s | Grind too fine | Coarser, or 0.5–1 g less coffee. |
Field notes glossary
Full circle
Never go back to the jar.
Know someone still drinking instant? Send them this, and a bag of fresh beans.