Sap Sago, also known as Schabziger (especially outside the U.S.) is hard, green, conical shaped cheese that comes from the Glarus canton of Switzerland. The cheese has been made since a least the mid 1400's.
The cheese gets its light green color from the addition of the herb blue fenigreek, a type of clover that grows in Glarus.
The cheese is hard, and has a strong flavor and aroma. It is usually used as a grating cheese, over pasta or vegetables. It is sometimes mixed with butter as a spread on bread.