3 jalapeño chiles
1/2 cup plus 2 tablespons tequila
1/2 cup plus 2 tablespoons lime juice (from about 5 limes), plus extra lime wedges for the glass rims (optional)
1/4 cup Cointreau or Grand Marnier
3 tablespoons guava juice
Coarse salt or margarita salt(optional)
Fill each glass with ice water and let it sit for a couple of minutes until the glass is nice and cold. Pour out the ice and water and then place the glasses in your freezer until they get that frosty look. This is a great trick for beer mugs too.