@ClearEyes
In midevil times a pot was a common cooking utensil. Potted peas was just mashed peas cooked in a pot and eaten by all social classes. So the firt thing that came to mind was mashed corn cooked in a pot or corn pottage.
Page 3, common translation mistake: while it is true that oboeru does literally mean "to remember, to memorise", it is commonly used to mean "to learn". That is the sense that Earth is using here: "... and you already learned them. You must have trained hard."
Thanks for the chapter!
What happened to Millie? First she's part of the group when Zwei calls out to MC, then she disappears and suddenly Cornpotage is there holding the tank's hand intimately.