rebdoniel: Star-K in holding it to be permissable (i.e. analagous to potatos) said that it doesn’t rise, but then I checked online for recipes for bread making and it explained how one gets quinoa to rise (similar to bread flower).
I suspect it will take a generation or two for this all to get settled down. There seems a reluctance to allow for anything that can be used to offer kosher-le-pesach challah, pizza and pita.
I wonder how long it took for everyone to decide that potatoes were kosher le-pesach when they were introduced 500 years ago.