Link: http://www.seriouseats.com/recipes/2012/04/the-best-frozen-lime-margaritas-recipe-tequila-cocktail-for-parties.html

4 ounces (1/2 cup) silver tequila (100% agave)
2 ounces (1/4 cup) high quality Triple Sec or Cointreau
2 1/2 ounces (5 tablespoons) juice from 4 to 5 limes
4 ounces (1/2 cup) simple syrup (see note above)
12 ounces ice (about 3 cups)

4 ounces (1/2 cup) silver tequila (100% agave) 2 ounces (1/4 cup) high quality Triple Sec or Cointreau 2 1/2 ounces (5 tablespoons) juice from 4 to 5 limes 4 ounces (1/2 cup) simple syrup (see note above) 12 ounces ice (about 3 cups)

1. At least 8 hours before serving: combine tequila, triple sec, lime juice, and simple syrup in sealable container that will fit in your freezer. Seal and place in freezer at least 8 hours and up to one week (mixture will remain completely liquid)

2, When ready to serve, add ice and tequila mixture to blender. Blend on highest setting, pulsing and scraping down sides as necessary until completely smooth. Serve immediately.