Suntory BOSS Coffee started its history in 1992 in Japan. It has since developed into numerous flavours. Boss Coffee Rainbow Mountain Blend can only be certified and named by the Guatemalan National Coffee Association. This particular coffee is a double espresso that uses a large amount of coffee beans for the extra richness. They also enhance the flavor with a little milk. It's a little sweet, so if you like sweet expressos, this coffee is definitely for you!