Add the sugar and basil leaves to an old-fashioned glass and muddle gently. Fill the glass with ice, add the gin and stir. Add the Strawberry-Apple Juice and stir. Top with club soda, garnish with the basil sprig and serve.
Juice the strawberries, then the apple, following your juicer's specific settings for each. Serve the juice immediately over ice, if desired.
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