I did have a high school English class covering (among other, non-medieval works) Sir Gawain and the Green Knight, and the story of Tristan and Iseult. Sir Gawain and the Green Knight was read in translation, but Tristan and Iseult was a fairly modern reimagining (set in the original period), with an author's introduction discussing how she chose to omit the magic that was present in the original because she thought it detracted from the agency of the characters.
Edit: found it - it was this one. https://www.amazon.com/dp/0374479828/ . "Tristan and Iseult: an inspired retelling of the legendary love story".