6 fluid ounces tequila
1 (6 ounce) can frozen limeade concentrate
4 fluid ounces triple sec liqueur
6 cups ice
1/4 cup coarse granulated sugar
Sugar the rims of 4 large margarita glasses. To do so, pour sugar onto a small plate, moisten the rims of the glasses on a damp towel and press them into the sugar.
In a blender, combine tequila, limeade, triple sec and ice. Blend until smooth. Add bananas and blend again until smooth. Pour into glasses and serve.