I agree with hiding them! Puree or grate them into dishes such as spag bog and casseroles. I always put grated zucchini and carrot in my bolognese sauce.

We realised early on that DD1 preferred salad vegies (which I know a lot are 'technically' fruits) so we just went with that a lot of the time. She has always and still does love capsicum (red especially), grape tomatoes, avocado and cucumber. She loves carrot these days but would much prefer it raw and corn on the cob is another fave.

Try raw and cooked vegies and also serving them with some dip such as French Onion). Some kids just suck the dip off though Juices can work really well too. And we also had a stash of the vegie Rafferty's sachets on hand as a 'squeezy' treat for DD1 when she was younger. She rarely knocked them back.