You can double this thick, icy concoction to serve a crowd; just be sure to prepare it in batches. Spoon immediately into frosty pitchers for serving--it melts quickly.
Combine first 3 ingredients in container of an electric blender; cover and process just until blended, stopping once to scrape down sides. Turn blender on high; gradually add ice, blending until smooth. Garnish, if desired. Serve immediately.
Christmas with Southern Living 1996