It's like one of those things..where...if you want to stay protected from STDs, you practice absitence.
If you want to purely and ultimately remain vegitarian, the best way to do it is not eat out .
Sometimes, at restaurants ...it is very easy to overlook some of the ingredients that compose the recipe.
Infact, you'd think for pizza..you have the dough, cheese, and ingredients. Well, from past experience more items go in making the dough (farina, yeast, brown sugar, eggs, grantulated garlic, salt, wheat rye, olive oil, and etc.) than the pizza itself.