Add gin, raspberry liqueur, lemon juice, and simple syrup.
Shake hard for about 10 seconds until well-chilled.
Double strain into a chilled coupe.
Top gently with chilled sparkling wine.
Garnish with a raspberry or lemon twist and serve immediately.
Notes
Adjust simple syrup to taste to balance sweetness and acidity. If you’re out of raspberry liqueur, muddle a few fresh raspberries with sugar before shaking. Serve right away to keep the fizz lively.