It actually seems to mix visual metaphors though, since "Butter and flour a loaf pan" and "Preheat oven" are temporally top-to-bottom, until it gets to the ingredients, when it switches to (depending on how one interprets it) temporally left-to-right or a dependency tree, but without any visual indication that change has happened

I would actually expect the whole process could be laid out in graphviz since all of those are dependencies of the ultimate outcome (heh, "enjoy"). I originally thought it may be a DAG, but I can recall a few recipes that explicitly have a looping step in them