Acorn
The nut of the oak, leached, roasted and ground into a coffee substitute that appears whenever coffee becomes unavailable. Its history is almost entirely a history of shortage, and it is the clearest case in the catalogue of a drink defined by absence.
Identity
- Botanical name
- Quercus robur
- Family
- Fagaceae
- Part used
- Seed
- Origin
- Europe, North America and East Asia — anywhere oaks grow
- Drunk in
- Germany, Poland, Korea, Turkey
Character
Nutty and woody with a residual tannic grip that leaching reduces rather than removes. Closer to a weak roasted grain drink than to coffee, whatever it was drunk in place of.
Notes: roasted nuts, wood, cocoa
History
Acorn coffee was drunk across Germany and central Europe during both world wars and through the blockades and rationing that followed, and German field rations included it. In Korea acorn is a food rather than an emergency measure — dotori-muk, an acorn jelly, is an ordinary dish — and the two traditions have nothing to do with each other.
How it is drunk
Brewed in central and eastern Europe within living memory and now largely a curiosity there. Korean acorn use is culinary and continuous, and the roasted drink appears alongside it.
Production
Acorns are shelled and leached in repeated changes of water to remove the tannins — the step that makes them palatable and the reason the process is slow — then dried, roasted and ground. Unleached acorn is undrinkably astringent.
Preparation
Roasted grain infusion · Decoction
Herbal infusion (tisane)
2–4 g/100 ml · 95–100 °C · 6 min
Category-typical for roasted grain drinks rather than measured for this grain. Roasted material is already cooked, so the usual failure is under-dosing rather than over-steeping.
What gets confused
Oak species differ enormously in tannin, and the leaching required varies with them. Commercial acorn coffee is rare and most of what exists is home-made.
Common mistakes
- Skipping the leaching. Unleached acorn is so astringent it is genuinely unpleasant.
Related botanicals
- Chicory root — Roasted materials that stood in for coffee under blockade and rationing, and that outlived the shortage as curiosities.
Comparisons
- Acorn vs chicory root — Two roasted materials that stood in for coffee under blockade and rationing. One outlived the shortage and became a choice; the other is now largely a curiosity.
- Acorn vs carob — Two roasted materials that stood in for something else — coffee and cocoa — and neither of which really resembles what it replaced.
Guides
Evidence for this page
This page is TeaHQ synthesis throughout. No external source stands behind any statement on it, including the botanical name. Twenty of the 150 botanicals have had their names and distribution checked against a taxonomic authority and this is not one of them.
Brewing parameters here are typical practice for the category rather than measurements of this plant, and each set says so.
This page makes no safety claim. It describes what Acorn is, where it comes from and how it is prepared — not what it does to a person. The absence of a safety note here is not a statement that the plant is safe. How TeaHQ handles this.