Knowledge Graph

Coffee is an evergreen flowering plant; what ends up in the cup comes from its seed.

Arabica and Canephora (Robusta) are different species; genetics shape both flavor and growing needs.

Varieties and cultivars are genetic distinctions within a species.

Country, region, farm and microclimate, together with human farming decisions.

Temperature, rainfall and seasons decide whether coffee grows, and when it flowers and ripens.

Elevation acts mainly through temperature, changing how fast the fruit ripens.

The fruit of the coffee plant: skin, pulp and mucilage around (usually) two seeds.

Selective picking versus mechanical harvest is ultimately about how well ripeness is controlled.

The steps that separate the seed from the fruit and dry it: washed, natural, honey and hybrids.

Microbial activity during processing; it can be controlled, or it can go wrong.

Bringing moisture down to a storable level; speed and evenness both matter.

Dried, hulled and sorted seed awaiting roast; moisture, defects and storage decide its stability.

A heat-driven transformation — drying, browning, gas, first crack, development — that changes flavor and solubility.

How fast and how much heat reaches the beans during roasting, which sets when each stage arrives.

Roast date, CO₂ degassing, resting and staling, and how air, heat, light and moisture affect storage.

Turning beans into particles to expose surface area to water.

"Grind size" is not one particle size but a distribution: fines, a main peak and boulders.

Water is not neutral: minerals, hardness and alkalinity change extraction and taste.

How many grams of coffee you use. It sets the ratio and also how deep the bed (or puck) is.

Coffee dose relative to water; it mainly sets the strength of the cup.

Hotter water dissolves coffee faster.

How long water and coffee are in contact. In percolation, time is often a result of grind and flow rather than an independent dial.

Stirring, pour impact and swirling that bring water and particles into fuller contact.

How fast water moves through the bed, set by particle size, bed structure and pressure; method-dependent.

How much — and which — soluble material water takes from coffee: under-, over- and uneven extraction.

The concentration of dissolved coffee in the cup — not the same thing as extraction.

Coffee steeps in all of the water for a time, then is separated.

Water flows through a bed of coffee, fresh water continually carrying solubles away.

High-concentration percolation under pressure through a compact puck: dose, yield, pressure, time.

An espresso machine pumps water through a compact puck; pressure drives the flow and the puck resists it.

Protein, fat, steam and temperature together decide the texture of microfoam.

Aroma, acidity, sweetness, bitterness, body and aftertaste — perception first, vocabulary second.

Liking a cup and judging its quality are two different questions.