I bought a little bottle of Cussons handsoap on sale called “Mallow Magic”, and just noticed today that the label very proudly claims “Trusted Since 1869”.
I chuckled to myself thinking “Well, surely they didn’t have marshmallows back then…” Boy was I wrong.
Here are some old timey recipes (I think I might try the second one): https://www.newlifeonahomestead.com/how-to-make-marshmallows-from-marshmallow-plant-root-recipe/