Plymouth also produces a sloe gin, but has discontinued its Fruit cups and Damson liqueur. Melton Mowbray Sloe Gin is a liqueur with a distinctive flavour. Sloe gin is a British red liqueur made with gin and sloes. The "U.S.S. 44 Special" was Old Tom gin, sloe gin and lime juice. The traditional way of making sloe gin is to soak the sloes in gin. Shillelaghs are traditionally made from blackthorn (sloe) wood ("Prunus spinosa") or oak. Sloe Gin is the sixth studio album by American blues rock musician Joe Bonamassa. Recipes for sloe gin vary depending on the maker's taste. Joe Bonamassa also covered the song on his album "Sloe Gin". In 1906 Gordon's Sloe Gin went into production. An annual sloe gin competition is held in Dorstone. Sloe gin has an alcohol content between 15 and 30 percent by volume. Other examples include sloe ("Prunus spinosa") and ivy ("Hedera helix"). There were 30 Sloe Gins entered in the 2015 competition. Sugar is required to ensure the sloe juice is extracted from the fruit.