If you enjoy a salted glass, prep the rim of your glass by rubbing a lime wedge along the rim. Dip in tequila salt or tajín, 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, cointreau, orange juice, 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 orange margarita through the strainer and pour it into the prepared glass. Garnish with a wedge of lime and additional jalapeño slices.