1. Make the jalapeño tequila.
2. Add the jalapeño to the tequila and let it sit at room temp for a few hours or up to a day.
3. Remove jalapeños and pour into a small serving glass.
4. Serve on the side so guests can add as much or little spice as they like.
5. Mix together the margarita ingredients.
6. Add a few drops of the spicy tequila, to taste, to finished margaritas. (it's very spicy - start with less, you can always add more)