Curaçao

Curaçao is a traditionally orange flavoured liqueur. It comes in a range of colours including white, blue and green.

From Wikipedia:
Curaçao is a liqueur flavored with the dried peel of the Laraha citrus fruit, grown on the Dutch island of Curaçao.

Spanish explorers brought the bitter Seville orange to the island in 1527, the progenitor of the Laraha. Although the bitter flesh of the Laraha is unpalatable, the peels are pleasantly aromatic.

Senior & Co, a company started in Curaçao, is the only company that has always produced its liqueur from the peels of the Laraha. The Jewish family, Senior and Chumacairo, started selling their liqueur in 1896 in their pharmacy in small quantities. In 1947 they bought the Landhuis... Chobolobo in Willemstad, where the distillery has since been housed. As this company is the only one that uses Laraha fruit from Curaçao, it affects the word "genuine" on its labels.