Start to finish: 10 minutes
1 teaspoon lime juice
1 teaspoon lemon juice
½ ounce Cointreau or other orange liqueur
Sparkling wine, chilled
Lemon twist, to garnish
In a Champagne flute, gently stir together the lime juice, lemon juice and orange liqueur.
Top with sparkling wine, then garnish with a lemon twist.