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