If you enjoy a salted glass, prep the rim of your glass by rubbing a lime wedge along the rim. Dip in tequila salt, and set aside.
Make the marg:
Add the jalapeño rounds (slices) with or without the seeds (the seeds add heat) inside a cocktail shaker. Add the lime juice and simple syrup, and using a muddler, press down to release the jalapeño juices.
Add the tequila and a handful of ice cubes. Shake well until the sides are fully frosted.
Serve:
Fill the prepared glass with fresh ice. Strain the spicy margarita through the strainer and pour it into the prepared glass. Garnish with a wedge of lime and additional jalapeño slices.
Notes
Make it a pitcher (serves 8) by adding ½ to 1 sliced jalapeño to the bottom of a pitcher. Measure and pour 1 ½ cups tequila, 1 ½ cups Cointreau or triple sec, 1 ¼ cups lime juice, and ¾ cup of simple syrup into the pitcher. Use a wooden spoon to stir and refrigerate for 1 hour or overnight. Prepare the glasses, add ice, and serve.