An analytical path from a single leaf to the cup in your own hand. Tea has the cleanest spine of anything in the series: one plant, Camellia sinensis, and the entire category map organized by one variable — how far the leaf is oxidized. Fifth in the Structure First series, alongside wine, cacao, cheese, and bourbon.
0 of 20 sessions complete
Before you start — three things.
1 · Open the files in a browser, not a file preview. These pages run on JavaScript (the tasting instrument, decoders, the oxidation dial, the leaf calculator, quizzes, flashcards). On iOS, open in Safari (or host the folder) rather than a Files-app preview, and everything works.
2 · Progress saves per device under one shared key, so your place and quiz scores carry across all seven files on the same browser. Tasting needs actual tea — the one thing the course can't supply.
3 · Brewing is part of the course, not an afterthought. Unlike wine or whisky, in tea you perform the final production step — so a kettle you can control the temperature of (or just a thermometer) will teach you more than any single expensive tea. Session 15 is where that pays off.
Three good next steps: go deep on one type (oolong and pu-erh each reward a lifetime); learn gongfu hands-on with a simple gaiwan, which transforms how much a good tea will show you; and keep a tasting log that records brewing parameters, so you can reproduce the cups that worked.
The framework transfers, too — the same "one variable organizes the category" thinking you used for oxidation is exactly how the cacao and coffee worlds are best understood, if you want an adjacent leap.
Additional Readings
Definitive resources on tea varieties, terroirs, and traditional brewing:
Tea: History, Terroirs, Varieties by Kevin Gascoyne et al. — The most detailed visual and scientific reference on world tea production.
The Tea Enthusiast's Handbook by Mary Lou Heiss & Robert J. Heiss — A compact, practical guide to sourcing and appreciating fine teas.