The "grattachecca" is a must for anybody who visits Rome, especially during the summer months. The word is tipically roman and comes from "checca" which, in the old roman dialect, meant ice and "gratta" meaning to scratch. Basically the ingredients are crushed ice with aromatic syrups or fruit juice. It shouldn't be confused with the sicilian granita which is done first combining the water with the syrups and then leaving everything freezing. In Rome there are several stands selling the grattachecca but maybe the best one (also in terms of waiting time for the long queues!) is the one situated in the Prati area (metro A - Ottaviano S.Pietro station) in Via Trionfale, at the corner with Via Telesio. The grattachecca here is sold since 1933 and the prices seem to be reasonably fair compared to the ones of other places in the center. Don't miss the specialities with pieces of fresh fruits.