Instructions
- Chill a champagne flute in the freezer or by filling it with ice water.
- In a shaker, combine elderflower liqueur and fresh lemon juice.
- Add ice and shake gently to chill the mixture.
- Strain the mixture into the chilled champagne flute.
- Top with sparkling wine, filling to the rim.
- Garnish with a sprig of fresh rosemary.