Place all ingredients in a blender or food processor and process until smooth. Strain through a fine mesh strainer and discard pulp. If sugar is not dissolved, continue to stir until it is.

Pour mixture into ice cube trays and freeze until solid. To serve: Place cubes in a single layer in a food processor and pulse several times to create uniform ice particles. Repeat as necessary with remaining cubes and serve immediately in frozen stemmed glasses. Yield: 4 servings