Almond milk: actually invented by the Church 700 years ago.
Rather than animal milk, Medieval cooks turned to something they could depend upon, and that was the milky liquid produced by grinding almonds or walnuts. This liquid, high in natural fats, could be prepared fresh whenever needed in whatever quantities. It also could be made well ahead of time and stored with no danger of degeneration. Because of its high fat content, it, like animal milk, could be churned into butter, and because it was not animal milk, it could be used and consumed during Church designated meatless days. [Catholic Culture]