Italian Amaretto Margaritas

Just in time for my birthday, I may have to try this one out instead of my usual


4 fluid ounces amaretto liqueur, plus additional
white sugar
6 fluid ounces frozen limeade concentrate
6 fluid ounces tequila
1/2 cup orange juice
6 cups ice 

Dip the rims of 4 margarita glasses in amaretto, then into sugar; set aside. Pour the limeaid, tequila, amaretto, orange juice, and ice into the bowl of a blender. Puree until smooth, then pour into prepared glasses.