alt the rim (optional): Rub a lime wedge around the edge of your glass, then dip into kosher salt or flaky sea salt.
In a shaker, combine tequila, lime juice, and orange liqueur. Add agave syrup if desired.
Add ice and shake for about 15 seconds until well-chilled.
Strain into a rocks glass over fresh ice.
Garnish with a lime wedge or wheel.