This drink dates to the 1920s when the Royal Hawaiian was one of the first (and most elegant) hotels on Waikiki Beach. Originally called a Princess Kaiulani, the cocktail became the namesake of the hotel by the 1950s, so the name changed to reflect that distinction. Few of the cocktails served in Hawaii, including the various versions of Mai Tai, are truly as Hawaiian as this original Royal Hawaiian. The key is getting the proper portion of the orgeat; too much, and you'll think you're drinking almond extract. And the delicious foamy top is in lieu of a garnish.