Step 1

In a cocktail shaker add jalapeño slices, tequila, Cointreau, and lime juice.

Step 2

Muddle with a wooden cocktail muddler to break up the jalapeño and infuse the tequila.

Step 3

Fill shaker with ice and shake until well chilled.

Step 4

Dip the rim of cocktail glass in Chamoy sauce and then in Tajin.

Step 5

Fill with ice and fresh slices of jalapeño.

Step 6

Strain margarita into prepared glass, discarding the muddled jalapeño and old ice.

Step 7

Garnish with lime.