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In a cocktail shaker with a muddler, muddle lemon juice and basil together until oils are released.
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Pour the whiskey and lemonade in and stir with a cocktail spoon.
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Using a cocktail filter, poor equal parts of mixture into two small glasses filled with ice.
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Top with Voveti Prosecco.
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Garnish with a slice of lemon and a sprig of sugared rosemary.