The Royal Daiquiri takes the basic rum-lime-sugar daiquiri and replaces most of the sugar with Parfait Amour, a violet-hued liqueur built on vanilla, rose, and citrus. Multiple cocktail sites repeat the same claim — that Don the Beachcomber built this in Hollywood sometime in the 1950s — but none of the sources this site checked point to a primary document: no original Beachcomber menu, no citation to Jeff "Beachbum" Berry's archival research, just the same attribution passed from site to site. Treat the Beachcomber credit as a well-worn claim rather than an archivally verified one.
The vanilla really sings, the rose petal really comes out — a subtle lilac color on an already lovely drink.
A Claim Without a Citation
Search enough cocktail blogs and the same sentence turns up again and again: Don the Beachcomber made this in the 1950s. It's a plausible story — Beachcomber's bars were famous for exactly this kind of daiquiri riff, swapping in an odd liqueur for the sugar — but plausible isn't the same as documented, and this site couldn't find the recipe traced to an original Beachcomber menu or a book like Berry's Sippin' Safari the way some of this batch's other drinks are.
What's not in question is the drink itself: Parfait Amour brings its own sweetness, so cutting the syrup down to a supporting role lets the rum and lime stay in balance instead of getting buried.
The Spec
This follows the modern reconstruction most commonly served under the name: a light rum base, a real pour of Parfait Amour standing in for most of the sugar, fresh lime, and a small top-up of rich syrup, blended flash-style with crushed ice in the old Beachcomber manner rather than shaken.
Why Parfait Amour, not violet liqueur
Parfait Amour and crème de violette get confused constantly. Parfait Amour is citrus-and-vanilla-based with a rose note and its own real sugar content; crème de violette is a straighter floral liqueur with less built-in sweetness. Swapping one for the other changes both the color intensity and the balance, so if crème de violette is what's on the shelf, add a touch more syrup to compensate.
Blended, not shaken
The old Beachcomber bars ran spindle blenders for exactly this style of drink — a quick flash-blend with crushed ice that aerates and dilutes faster than a shake, giving a slightly frostier, softer texture. A hard shake with cracked ice and a fine strain gets close if a blender isn't handy.
Bottom Line
Provenance aside, the Royal Daiquiri is a genuinely pretty variation — pale lilac, floral without tipping into perfume, and an easy way to put a bottle of Parfait Amour to good use beyond the rare recipe that calls for it.