• lime wedges
• kosher salt, placed in a shallow dish
• ice, crushed
• 2 ounces tequila 
• 1 ounce triple sec 
• juice of 1 lime 

Method

Run a wedge of lime around the rim of a glass.
Dip into salt.
Fill the glass with ice. 
Add tequila, triple sec, lime juice. 
Stir.