The Boss Hog The Spirits of Mauve Fifth Edition is a 13-year-old, 750 ml bottle of whiskey from Whistlepig. It is a limited edition release, and is made from a blend of rye whiskeys aged in American oak barrels. The whiskey is finished in Calvados casks, giving it a unique flavor profile. The whiskey has notes of apple, pear, and spice, with a smooth finish. It is bottled at a cask strength of 115.2 proof, and is best enjoyed neat or with a few drops of water.