Some countries in europe traditionally have a lots of meet in their food, but that doesn't mean, that they don't know what vegetables are. So head up, yes be careful in Polland, it can happen that you get pig fat fried potatos, but that is all. But last couple of years almost every place has a vegeterian meal, so just check it, if it is alright for you and that is it
And Harishmani: yes they do know what apples are) you won't be hungry.
Another thing in Europe is that there are a lots of emigrants there from all over the world what means international foodstores and restaurants. I'm sure that you will be able to find a place that suits your needs.
Enjoy your staying in Europe!