The term 'Not a Pretty Fruit' is referring to the UGLI fruit, which is a hybrid of a tangerine, grapefruit, and an orange. It has a bumpy, unattractive exterior, but its juicy, sweet-tart flavor makes it a popular snack. The UGLI fruit is native to Jamaica and is now grown in other parts of the world. It is also known as the uniq fruit, and its scientific name is Citrus reticulata x paradisi.