Place the basil and mint leaves into a cocktail shaker and crush lightly (muddle) with a long-handled teaspoon.
Add the orange juice, watermelon chunks, sugar syrup and cognac. Add one scoop of the crushed ice and shake well.
To serve, fill a tumbler with the remaining crushed ice. Strain the mixture into the tumbler. Garnish with the wedge of watermelon and the mint sprig.
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