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I thought German wartime ersatz coffee was made from acorns ?
Yes, apparently it's been made since the 18th century. A longer article in German here (look for "Eichelkaffee"):
https://de.wikipedia.org/wiki/Kaffee%C3%A4hnliches_Getr%C3%A4nk
My grandmother used the term "Muckefuck" (pronounced roughly as 'mookafoock') both for Eichelkaffee during the war, as well as for Caro (made by Nestlé), which became popular in the aftermath of the war, and which she, like many Germans of her generation, drank until the end of her life.
I thought German wartime ersatz coffee was made from acorns ?