Cut jalapeno into thin rings and place the rings into the lemon juicer (I find that 3-4 jalapeno rings per cocktail is enough but you may like it spicier.)
Squeeze the lime juice through the jalapenos to incorporate the spicy jalapeno juice with the lime juice. Squeeze orange juice as well and add both juices into the cocktail shaker.
Add tequila, orange liqueur, and agave nectar to the shaker. Add some ice into the cocktail shaker. Shake the mixture vigorously for approximately 20 seconds.
Salt rim: Rub the rim of your glass with a lime wedge, then dip it into some salt to create your salt rim. Set aside.
Strain the margarita mixture into the prepared glasses. You can serve it over ice or straight up.
Notes
Remember, the best ingredients make the best margaritas. Try to get the best tequila and orange liqueur and squeeze fresh lime.
Based on personal preference, you can serve margarita over ice or neat.
Add more or spicier jalapenos to make your margarita more spicy.