Leave it to Friend of Milk Street Nik Sharma—writer, photographer, former molecular biologist and author of the cookbook “The Flavor Equation” (order here) to come up with a simple syrup that leaves us wanting to experiment. When Milk Street Editorial Director J.M. Hirsch spotted a bonus beverage from the book for a sumac and saffron syrup that Sharma uses in a refreshing spritzer, a margarita came to mind. Specifically, a margarita Hirsch calls the Sumac Sunset. Sumac is a citrusy spice often used in Middle Eastern cooking to add a punch of acidity. In this drink, it takes the place of citrus juice. Watch Hirsch mix up this tart, refreshing drink and check out Sharma's book for more delicious recipes that will make you think!