How do you make polenta without corn? Seriously, what do you use?
I was surprised by that too but I guess some other type of grain.
Technically, the word "corn" was used in Britain to refer to other grains before maize was introduced. In fact, in the UK even today what Americans call "corn" (maize), the British more often call "sweet corn" - I presume because when maize was introduced to Europe, it was called sweet corn to distinguish it from other grains they called corn. Although they no longer call other grains "corn", the term "sweet corn" seems to have stuck in the UK.
I'm guessing the word polenta may have been used in the same way - until it became synonymous with cornmeal/sweet corn/maize, it may have been used to refer to other grains.
Wiki says about the etymology:
"Latin
polenta covered any hulled and crushed grain, especially barley-meal, and is derived from Latin pollen 'fine flour', which shares a root with pulvis 'dust'.[4]"
And goes on to say:
"As it is known today, polenta derives from earlier forms of grain mush (known as puls or pulmentum in Latin or more commonly as gruel or porridge), commonly eaten since Roman times. Before the introduction of corn (maize) from America in the 16th century,[5] polenta was made with such starchy ingredients as farro, chestnut flour, millet, spelt, and chickpeas.[6]"
So the meaning of the word has changed over time.