Mix the salt and chili powder on a small plate for the rim.
Run a lime wedge around the edge of the glass.
Dip the glass in the chili-salt mixture.
Add jalapeño slices to the shaker and muddle gently to release oils.
Pour in tequila, lime juice, triple sec, and agave nectar.
Fill the shaker with ice and shake for 10-15 seconds.
Double strain into the prepared glass filled with fresh ice.
Garnish with a jalapeño slice and lime wheel if you like.
Notes
Change the amount of jalapeño to adjust the spice level.Remove all seeds to reduce heat.Fresh lime juice works best—avoid bottled versions for the best taste.Store the chili-salt rim mixture in an airtight container for up to 1 month.Double strain through a fine mesh strainer to remove any jalapeño pieces for a smoother drink.