How to Make It
Fill a cocktail shaker with ice; add Pineau des Charentes, lemon juice, syrup, and bitters. Hold 1 of the lemon peel strips by a long edge, skin facing down in shaker. Pinch peel strip to express citrus oils; drop into shaker. Cover and shake vigorously. Strain into an ice-filled Collins glass, top with sparkling wine, and garnish with remaining lemon peel strip.