@izaya I've been meaning to look up how humans started leavening bread this way. the weird thing really is grinding grains down to flour: like why would you think that makes sense if you'd never done it? and then baking it? you can imagine how you get yeast from unleavened bread dough: you just forget about it and leave it out for a while then still be hungry enough to cook that weird sticky dough that's bigger for some reason
@Pat thanks. it wasn't really a sourdough bake: I was trying to use this sponge method I saw mentioned on a forum, but I doubt I got all the details. Haven't really tried making sourdough yet.
That's an interesting theory about grinding. Somewhat related: you know they sell snacks that are just potato chip crumbs like you get from the bottom of the bag? Go figure