Make turmeric simple syrup by whisking together water, granulated sugar, and turmeric in a small sauce pot over high heat. Bring to a boil for 5 minutes or until sugar is completely dissolved. Strain through a fine mesh strainer over a heat-resistant container and place in refrigerator to cool.
Make the cocktail mixture by combining the measured amounts of whiskey, lemon juice, lime juice, and turmeric simple syrup. Stir to combine.
Fill a cocktail shaker halfway with ice and then fill two-thirds full with the cocktail mixture. Shake for 30 seconds and pour into glasses with ice. Add a maraschino cherry for a classic sour or garnish with rosemary for a fun twist!
Serve ice cold. Enjoy!