
Add cucumber wheels, jalapeño wheels, and tequila to a shaker.
Muddle until fully pulverized (about 10 seconds).
Add agave syrup and lime juice, then fill shaker with ice and shake until well-chilled (15-20 seconds).
Double-strain through a fine mesh strainer into a Tajín-rimmed rocks glass filled with fresh ice.
Garnish with a cucumber slice.