Make the anise simple syrup by combining water and sugar in a small saucepan on medium heat. When sugar is dissolved, add 10 star anise pods. Cover and simmer for 10 minutes, then turn heat off and let steep for at least 1 hour. Let cool. Syrup will be good in the fridge for at least a week.
To assemble the cocktail, fill a cocktail glass with ice. Pour Pisco over ice. Add 1/2 ounce anise simple syrup, lime juice, bitters and stir once. Top with ginger beer and garnish with star anise.
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