Run a lime wedge around the outer rim of a rocks glass, then press the rim into a plate of fine sea salt to coat.
Fill the rocks glass with ice cubes and set aside.
Add the tequila, Grand Marnier, and fresh lime juice to a cocktail shaker.
Fill the shaker with ice.
Shake hard for 10 seconds until well chilled.
Strain into the prepared rocks glass over ice.
Garnish with a lime slice on the rim.
Using Grand Marnier instead of standard triple sec adds a cognac-based depth and richer orange character that elevates this Margarita above the ordinary - worth the upgrade every time.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Grand Margarita.