Prepare the Glass: Start by rimming your glass with Tajín or salt. To do this, rub a lime wedge around the rim of the glass, then dip it into a plate of Tajín or salt until fully coated.
Muddle the Jalapeño: In a cocktail shaker, add 2-3 slices of fresh jalapeño. Muddle them with the back of a spoon or muddler to release the spicy oils. If you want more heat, you can leave the seeds in, but removing them will make the drink a little milder.
Add Ingredients: To the shaker, add tequila, freshly squeezed lime juice, triple sec, and agave syrup. Fill the shaker with ice cubes.
Shake It Up: Shake the mixture vigorously for about 15 seconds to ensure it's well chilled and the flavors are combined.
Strain and Serve: Strain the cocktail into your prepared glass filled with fresh ice. You can use a fine-mesh strainer if you want to remove the jalapeño bits for a smoother drink.
Garnish: Garnish with a lime wedge or a slice of jalapeño for an extra kick and a pop of color.
Enjoy! Sip and savor the spicy, tangy, and refreshing flavors of your homemade Spicy Margarita.