Rim the tall glass with chilli salt. To do this, spread chilli salt on a small plate. Rub a lime wedge around the rim of the glass, then dip the rim into the chilli salt until evenly coated.
In a shaker, combine the tequila, freshly squeezed lime juice, agave syrup, and a pinch of chilli flakes.
Add ice cubes to the shaker.
Shake the mixture vigorously for about 10-15 seconds to chill the drink and infuse the flavors.
Strain the mixture into the prepared tall glass filled with ice cubes.
Garnish the drink with a lime wedge and a sprinkle of chili flakes if desired.
Serve immediately and enjoy your spicy margarita with a tantalizing chili salt rim!
Feel free to adjust the amount of chili salt and chili flakes according to your desired level of spiciness.