No no, you've still got it wrong!

It's made from a flower, a rare but now successfully domesticated flower. The Tu-Tue flower does require extensive processing, sort of like how corn has to be soaked in something, like ashes, to release its nutrients.

Tu-tue requires a similar process, but just as with natives in the new world and corn, ancient Romans simply knew that washing the flowers in a hot-spring near Getti made the final product palitable, without knowing why.

Spa being of course, latin for 'hot wash', thus spa-getti.

Hope this helps.