Buena suerte! It's just a mortar+pestle made from volcanic rock. A standard issue ceramic version will do fine provided you don't reduce the contents to Gerber-like ooze. Volcanic stone only really matters for something like a metate for grinding corn--tamales made from hand-ground fresh limed corn is heaven. Recipes? Check Diana Kennedy or Elizabeth Lambert-Ortiz. Just don't sucker for one of the concrete versions on offer around the GTA.