1 cup strawberries, hulled and halved
1 ripe banana, peeled and sliced
4 1/2 ounces (1/2 cup plus 1 tablespoon) tequila
1 1/2 ounces (3 tablespoons) triple sec
2 tablespoons fresh lime or lemon juice
1 cup crushed ice
Place strawberries and banana slices on a plate and freeze at least 1 hour.
Place all ingredients in a blender and blend until smooth but still very thick.
Pour into chilled margarita or other stemmed glasses.