In a cocktail shaker with a muddler, muddle lemon juice and basil together until oils are released.

Pour the whiskey and lemonade in and stir with a cocktail spoon.

Using a cocktail filter, poor equal parts of mixture into two small glasses filled with ice.

Top with Voveti Prosecco.

Garnish with a slice of lemon and a sprig of sugared rosemary.