Epazote. It's Mexican. It's poisonous in large amounts, delicious in small portions. And it can be damn hard to find if you don't live in Mexico or have a Latin market or Hispanic grocery store nearby. Still, with the prospect of making Mexican pinto beans with the epazote IF you can find some, you're going to want to search for it where you live!
You can find the authentic Mexican recipe for frijoles de la guolla above at that link.
I hope you enjoy this one!