"Vegetables" can be a non-count noun, which means "vegetables en masse", in the context of e.g. a greengrocer's display or the accompaniment to your beef and mustard.
But it can also be the plural of the count noun "vegetable", meaning either "kind of vegetable" or (less often) "individual vegetable". Thus:
1. Meat and two veg(etables) = meat and two kinds of vegetable.
2. There are two vegetables in the bathroom – a carrot and a potato. Who put them there?
All the best,