So I'm an Argentine-o-phile and have some left over yerba mate (pronounced MAH-teh) from my last trip down there. It's a leafy herb used to make tea and is consumed throughout the day for a shot of energy. Every single Argentine household, rich or poor, has supplies for making mate. Not even exaggerating. If you've never tried it, I highly recommend it.
Anyway, I'm still searching for an earthy flavor/aroma to go with my American amber ale. I'm thinking it could add some nice earthy qualities to my beer without being overly herbal. Any thoughts? How would one go about adding it to a beer?