Method

Pour the margarita juice into an ice cube tray of choice 

Place in the freezer until solid 

After this, in a medium saucepan, combine the sugar, water, & jalapeño. Bring the mixture to a rolling simmer over medium-high heat and cook, stirring frequently, until the sugar has completely dissolved.

Then reduce to the heat to medium-low and continue simmering, stirring occasionally, for 15 minutes. Remove from heat and set aside to cool for at least 30 minutes. 

Once cool, strain syrup into a small bowl. Discard jalapeño peppers. Set syrup aside to cool

When the margarita juice is frozen, combine the frozen margarita juice + lemonade + 1/2 cup jalapeño syrup + 1 cup tequila into the blender 

Blend until smooth 

Pour and enjoy! This makes 4 servings.