Grom is not merely another gelateria with a few vegan sorbets: They are making commendable efforts for ecological sustainability, growing their own organic fruits for use in their sorbets, using FSC-certified paper and compostable utensils.
As another reviewer has noted, the dark chocolate is *not* vegetarian (contains eggs). As of May 2014, none of Grom's gelatos are vegan (though most of the sorbets are). For ingredient list, see http://www.grom.it/ita/intolleranze.php (but keep in mind it might not be completely up to date).
Indeed, it is unfortunate that so few vegan items are available, because they know how to do them well. On my visit, there were only three, and of these only one (limone) was labeled organic.
I hope Grom will continue to move toward a more vegan-friendly and eco-friendly model.
Cons: limited vegan options