At Nine Lives, the drink is then served in a ceramic skull with a watermelon popsicle (pictured).
To make the pistachio shrub
Crack pistachios with a knife for more infusion surface.Gently warm the water and sugar to make a 1:1 syrup. Once all sugar has dissolved, add the pistachios, bring to a boil and lower to a gentle simmer.
Simmer for 30 minutes. Remove from heat, add the vinegar and let it cool down. Once cooled, strain into clean glass bottles and refrigerate.