Yuba Noodle is a delicacy, apparently, made from the “skin” that forms on heated soymilk. It comes clumped together and when you cut it up (here I made strips about 3/4″ wide each), the layers tend to separate into something sort of like a noodle. Like tofu it is pretty flavorless until you add some kind of seasoning. I cooked mine with Tamari and some other stuff, using a meal kit from Munchery.
Here is the package: