Set out a wide, shallow bowl with equal parts Lime Juice and Simple Syrup, and a second wide, shallow bowl with a layer of Worm Salt.
Dip a rocks glass into the Lime/Syrup mixture, then into the Worm Salt, and set aside.
In a mixing tin half-filled with ice, combine:
Cover with a mixing glass and shake until the tin is frosted.
Strain into your salt-rimmed rocks glass over fresh ice.