Espresso extracting from a naked portafilter into a white cup, golden crema visible

JayArr Coffee

Exploring specialty coffee through science, scoring, and honest reviews. From origin to cup.

Explore the Collection Read Articles

Deep Brew Mode

Latest

Articles

View all →

Science May 11, 2026

Coffee Leaf Rust: How Hemileia Vastatrix Rewrote the Global Coffee Map

Hemileia vastatrix killed Ceylon's coffee in 1869, crashed Central America in 2012, and now the resistant varieties saving us are failing. The full history.

Origins May 10, 2026

Juan Valdez and the FNC: How Colombia Branded Its Coffee (1927–2026)

How the Federación Nacional de Cafeteros, Doyle Dane Bernbach, and a fictional Andean farmer turned anonymous Colombian beans into the only branded commodity in coffee history.

Origins May 9, 2026

Stumptown vs Blue Bottle: Two Third-Wave Originals Compared

Stumptown and Blue Bottle are the two anchor third-wave roasters in America. We compare history, flagship blends, roast style, pricing, and ownership in 2026.

Origins May 8, 2026

The Brazilian Coffee Kingdom: 1727–1944 History Explained

How Brazil became the world's coffee superpower — Palheta's 1727 smuggle, slavery and colonos, the 1906 valorization, and Vargas's 78 million burned bags.

Drinks May 8, 2026

What Is a Macchiato? Real Italian vs Starbucks Versions

A traditional macchiato is an espresso 'stained' with a small dollop of milk foam. Here's how it differs from a latte macchiato and Starbucks' Caramel Macchiato.

Brewing May 7, 2026

Cold Brew Concentrate: Ratios, Steep Time, and Dilution

Cold brew concentrate at 1:4–1:8 ratios, with the steep-time, grind, dilution, and shelf-life math worked out from the actual extraction research. The complete reference for batch prep.

Discover