Rub a lime wedge on the outside of a Collins glass, coat with kosher salt, and set aside.
Add all the ingredients to a shaker with ice, and shake until well-chilled.
Strain into the prepared Collins glass over fresh ice.
Garnish with a lime wheel.
*Cilantro simple syrup: Combine 1 cup white sugar and 1 cup water in a small saucepan. Simmer until sugar dissolves, then remove from the heat. Add 1 cup loosely packed cilantro, muddle gently, and let steep for 40 minutes. Strain out solids, and store the syrup in the refrigerator for up to 1 week.