Truluck's Italian Margarita
Truluck's Steak and Stone Crab (http://www.houstonpress.com/2000-07-06/dining/nutty-rita/)
triple sec (or Cointreau)
frozen limeade concentrate
Combine tequila, triple sec, limeade concentrate, orange juice, and crushed ice in a blender. Puree until slushy. Pour the cocktail into a large margarita glass and then pour the amaretto over the top. Yields one large margarita. Garnish with the orange slice.