100% agave. With agave worm. Monte Alban Mezcal is a truly authentic Mexican spirit. Made in Mexico and distilled from the Agave plant using centuries-old traditions and techniques, each bottle contains the famous Agave worm. Mezcal is tequila's 'big brother'. Almost 500 years ago Spanish conquistadors looking for a rum substitute began distilling an Aztec soft drink made from the Agave plant. They ended up with a premium spirit called mezcal.