3 oz (about ⅓ cup) fresh lime juice, plus lime wheels for garnish
1 ½ oz (3 tablespoons) orange juice
1 oz (2 tablespoons) agave or maple syrup (less or more to taste)
1 small jalapeño, sliced into thin rounds
Kosher salt, for rimming the glasses
Combine the tequila, lime juice, orange juice, agave, and 2 or 3 jalapeño rounds in a cocktail shaker. (Leave room for ice!)
Place enough kosher salt on the bottom of a small plate just to cover.
Moisten the rims of two cocktail glasses of your choice with water, let the excess drip off, then dip the rims in the salt and press to adhere. Carefully fill the glasses with ice, making sure not to dislodge the salt.
Add ice to the cocktail shaker with the margarita ingredients, shake vigorously, and strain into the glasses. Garnish the glasses with lime wheels and more jalapeño rounds.