In a mixing glass or shaking tin, combine the drink ingredients. Add ice and stir for 20 seconds. Strain into a chilled coupe. Garnish with Luxardo cherries speared on a toothpick.
For the Agave syrup
In a small bowl, whisk together the agave nectar and water. Store the syrup in an airtight container in the refrigerator for up to 2 weeks or in the freezer for up to 6 months.