THE COFFEE JACOB FIELD GUIDE / Learn
A little understanding goes a long way
Follow coffee from the farm to your cup, with useful explanations and sources you can inspect.
Follow the coffee
Understand its plant, trade, culture and roast. Explore varieties.
From coffee fruit to your cup
The bean is a seed. Your cup is the result of many people's decisions, and a bag becomes easier to understand once you can follow its journey.
LearnCoffee history: evidence, trade and living traditions
Coffee has no single simple origin story. The history of a plant, a beverage, a trading system and a social gathering are related stories with different evidence.
LearnUnderstand home roasting before you start
Home roasting is a separate craft with heat, smoke, chaff and cooling to manage. Start by deciding whether your space and a purpose-built roaster suit the job.
LearnChoose a home coffee roaster for your actual routine
Begin with the amount you drink and the place you can roast. Then compare machines against those requirements.
LearnLearn first and second crack from real recordings
Listen before you roast. The useful skill is recognizing a sequence of changes while following your machine’s operating limits.
LearnPlan a first roast with the exact machine manual
A first batch should teach you the controls, observable changes and cooling procedure. The machine’s complete manual supplies its operating limits.
LearnKeep a roast log that supports a fair taste comparison
A useful log connects a coffee, an operating sequence and a cup. Precision belongs in measured fields; uncertainty belongs in the observation fields.
LearnTroubleshoot a home roast without guessing the defect
Describe what you observed first. Then check the coffee, the machine and the brew before assigning a roast-defect label.
Measure and improve your cup
Keep strength, extraction, grind and water separate. Diagnose one next test.
Strength and extraction, explained with one cup
Strength asks how concentrated the drink is. Extraction asks how much of the dry coffee entered it. Separating them makes adjustments easier.
LearnFind a useful grind setting
A grinder setting is a place to begin. The useful result is a repeatable cup, and the same number does not mean the same grind on a different machine.
LearnCoffee water: taste, minerals and your machine
Water should be safe to drink, pleasant in the cup and compatible with the equipment. Those are three related checks, not one ppm target.
LearnTaste two coffees and learn something useful
Describe first, decide what you like second, and carry one useful observation into the next cup.
LearnA plain-language coffee glossary
Terms are useful when they help you make or choose a cup. These definitions keep similar-sounding measurements and claims separate.
Read consequential claims
Inspect health evidence and sourcing assurances before making a decision.
Understand the caffeine in your coffee
Cup size, concentration and total caffeine are different. A useful estimate keeps both the serving and the uncertainty visible.
LearnRead coffee health claims with care
A health headline can describe an association without telling you what coffee will do for you. Here is a practical way to read the evidence and its limits.
LearnRead sourcing claims and reduce coffee waste
A certification, a farmer payment and a carbon footprint describe different things. Look for the scope behind a claim, then choose changes you can actually make.
LearnFair for Life coffee: check the claim and the trade terms
Fair for Life has defined fair-trade requirements. Read the exact claim, then follow the certified product and its trading terms.
LearnStarbucks C.A.F.E. Practices: ownership, verification and limits
A company can own a standard and use external verifiers. Understand both roles, then ask what the sourcing claim actually establishes.