Part dignified and sedate, part celebration, this sophisticated, charming and seductive cocktail is wonderful to mix and sip.
1 ounce bourbon
1/2 ounce Cointreau liqueur
4 dashes Peychauds bitters
3 dashes Angostura bitters
Stir together bourbon, Cointreau, and bitters in a chilled glass. Top with cold sparkling wine.