Run a lime wedge around the rim of your glass, coating it evenly with juice. Pour coarse salt onto a small plate and gently press the moistened rim into the salt, rotating to coat only the outer edge. Set the prepared glass aside.

Cut your lime in half and juice it using a citrus reamer or handheld juicer, aiming for about 1 ounce of fresh juice. Strain out any seeds or large pulp pieces.

Add the mezcal, fresh lime juice, orange liqueur, and agave nectar to your cocktail shaker. Use a jigger to ensure precise measurements.

Fill your cocktail shaker about two-thirds full with ice cubes.

Seal your shaker tightly and shake vigorously for 15 to 20 seconds until the outside of the shaker becomes frosty and cold to the touch.

Fill your prepared glass with fresh ice if serving on the rocks. Strain the cocktail through the shaker's built-in strainer into your glass. For extra-smooth texture, double-strain through a fine mesh strainer.

Cut a thin wheel from a fresh lime and make a small slit from the center to the edge. Perch it on the rim of the glass or float it on top of the drink.

Serve immediately while ice-cold and perfectly balanced.