Vegetarian is not always “kosher by default”. Grape juice and wine--and products made from them--aren’t kosher by default, for example. And many people hold by

Vegetarian is not always “kosher by default”. Grape juice and wine--and products made from them--aren’t kosher by default, for example. And many people hold by cholov or pas yisroel, which means that milk or bread will need special supervision. Furthermore, the requirements for cleaning vegetables to make sure they're free of insects and insect parts is usually more stringent that what many vegetarians and vegans are used to.