Elderflower White Cosmo

From the New York Times last Sunday:

2ounces Snow Queen vodka
1 ounce St.-Germain elderflower liqueur
½ounce freshly squeezed lime juice
1ounce white cranberry juice
1orchid or edible flower, for garnish.
1. Shake the liquid ingredients in a cocktail shaker with ice and strain into a chilled martini glass.
2. Add the garnish and serve.
Yield: 1 serving.
Note: For the garnish, freeze the flower in an ice tray. Fill the tray halfway with water, freeze, and add the flower. Fill completely with water and freeze again. (Spherical ice trays, necessary to replicate Daniel’s large ice ball, are available at www.momastore.org and other online retailers. You can also just float an unfrozen flower in the drink.)

I've never had elderflower liqueur, so if anyone can fill me in on what this might be like, I'd appreciate it.

Apparently it's being promoted as "the sexiest cocktail ever." I've never thought of any cosmo as sexy, so that must be one hell of a liqueur and garnish.