Bols Blue Curaçao Liqueur is a bright blue, citrus-flavored liqueur made from the dried peel of the Laraha citrus fruit, which is native to the Caribbean island of Curaçao. The liqueur has a sweet, orange flavor with a slightly bitter finish. It is typically clear in color, but Bols Blue Curaçao is artificially colored blue to make it more visually appealing.