Place the strawberries and basil into a cocktail shaker and crush lightly (muddle) with a long-handled spoon.
Pour over the dark crème de cacao and herb and balsamic vinegar liqueur.
Add ice and shake well.
Scoop some more ice into a tumbler, then strain over the mixture.
To serve, hook a strawberry and the piece of chocolate over the side of the tumbler.
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