I've tried it...it's very good! For vegetarian, I would just leave out the eggs and substitute the shrimp for some deep fried tofu cubes. For the fish sauce, substitute in vegetarian fish sauce (available at many asian supermarkets). I think it's called Nuoc Mam Chay? When I was vegetarian, I would make pad thai with these substitutions and it was still very good. If you eat eggs though, I would recommend keeping it in, as it adds a lot of flavor. What does vegetarian fish sauce have? And what does it taste like? Would it not defeat the purpose of the sauce to have it be non-fish based? Or is the same flavor achieved using something else, maybe gluten from soy... Wondering.