Simplicity is everything in this delicately balanced classic Champagne cocktail. And balance is indeed essential! The liqueur should not be overdone. As Kingwell says in Cocktail Culture: "You want to taste the Champagne as it acquires new texture, not witness its murder by blackcurrants."
A reddish shadow cast by a Kir Royale cocktail.
Fill a Flute with ice and water to chill it for a moment, before discarding. Build the cocktail in the chilled glass.
Taste the cocktail and if necessary adjust the balance with a touch of extra sugar or citrus juice.