Margarita Ice

Directions

1. 1
   In a heavy medium saucepan, combine the sugar and water and bring to a boil over high heat.
2. 2
   Reduce heat to medium-low, stir, and simmer until the sugar dissolves, about 5 minutes.
3. 3
   Remove from the heat and cool slightly.
4. 4
   In a large bowl, combine the syrup with the lime juice, tequila, orange liqueur and bitter orange liqueur, and whisk well.
5. 5
   Pour into a rectangular freezer-proof container and freeze just until ice crystals begin to uniformly form, about 2 hours.
6. 6
   Remove from the freezer and scrape the mixture with a fork to break up the crystals.
7. 7
   Return to the freezer and freeze for 30 minutes.
8. 8
   Remove again from the freezer and scrape, then return to the freezer.
9. 9
   Continue the scraping/freezing process another 3 times, for a total of 4 hours.
10. 10
    (If not serving after 4 hours, tightly cover with plastic wrap and freeze until ready to serve.)
11. 11
    To serve, place the sugar crystals on a plate.
12. 12
    Dip the rims of 4 tall, stemmed glasses in water and then into the sugar to form a crust.
13. 13
    Divide the Margarita Ice between the glasses.
14. 14
    Garnish each rim with a lime slice, sprinkle with 1/2 teaspoon of lime zest, and serve immediately.