I found this place called De Groene Passage, a green place :)
It has a shop, supermarket and Spirit, its restaurant.
I went twice while in Rotterdam, it saved me. I wasn't able to find other place like this, meaning vegetarian and by that, more thna lettuce or salad (misconception of many).
The drawback I think, is that there is a bar and it is by the weight €2.25 for 100g so it can be expensive if you are starving or not if you control your portions.
They have a great selection of teas, I had the aryuvedic chai with soy milk, delicious. And a good assorment of desserts, some of them vegan.
Absolutely recomendable, wonder why it is in 100's place rated so low. Probably because not a lot of people knows about it.
But thanks to the owners, because I was able to eat what I like at this amazing place!