[throwup238]

> Topinambour would have been available in the middle ages.

No, Helianthus tuberosus [1] aka "topinambur" is Jerusalem artichoke which would not have been available at the time. It's a New World crop just like the potato.

We're talking about a book written in 1462, before the Columbian exchange. The plant wasn't introduced to Europe until the early 17th century.

[1] https://en.wikipedia.org/wiki/Helianthus_tuberosus