Ingredients: Served: Straight up: chilled, without ice. Drinkware: Cocktail glass. Method: Pour all ingredients except the wine into cocktail shaker, shake well with ice, strain into chilled elegant cocktail glass. Top up with the sparkling wine and garnish with mint sprigs. 4.5 cl aged rum, 2.25 cl fresh lime juice, 3 cl simple syrup, 2 dashes Angostura bitters, 6 to 8 mint leaves, 6 cl champagne brut or Prosecco