Prepare your glass: If salting the rim, run a lime wedge around the edge of your margarita or coupe glass. Invert the glass onto a small plate of coarse salt, rotating to coat the rim evenly. Set aside.

Combine ingredients: In a cocktail shaker, add the blanco tequila, fresh lime juice, orange liqueur, and agave nectar (if using).

Add ice: Fill the shaker about two-thirds full with ice cubes. Secure the lid tightly.

Shake well: Shake vigorously for about 15-20 seconds, until the shaker is well-chilled and frosty on the outside. This ensures proper dilution and aeration.

Strain and serve: Strain the mixture from the shaker into your prepared glass. If you prefer it 'up' (without ice), strain into the chilled, salt-rimmed glass. If you prefer it on the rocks, fill the prepared glass with fresh ice cubes before straining.

Garnish: Add a fresh lime wedge to the rim of the glass for a final touch.