Dry Shake: In a shaker, combine rosé, grapefruit juice, lavender syrup, and egg white. Shake vigorously without ice for about 10 seconds to build foam.
Shake Again: Add ice and shake again until well chilled.
Strain: Strain into a chilled coupe or flute glass.
Top with Champagne: Slowly pour Champagne to fill the glass.
Optional Garnish: Add a dried rosebud or lavender sprig for a delicate floral touch.
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