At 3.5 years your child is old enough to eat what you do, but he won't if you make a big deal of it - if you draw attention to a new food as something he might not like, he won't want to eat it. Put his plate in front of him and get on with eating your own meal; or if you're not eating with him, read a book or something - anything to make it clear that this dinner isn't a big deal (accept that this might be a bit messy for a couple of days). Remember that if you're giving him lots of attention when he acts up, you're rewarding the behaviour. Stay calm and don't be drawn into any kind of discussion; remember, when your child's three you don't have to justify anything to him - mummy/daddy said so, and that's all he needs to know.
If he complains or doesn't want to eat the food, DON'T offer to make anything else. If he really won't eat it, take it away and put it in the fridge - when he complains later that he's hungry, warm it up and put the same thing in front of him again. It will seem very harsh for the first few days, but it won't take him long to realise that throwing a temper tantrum won't make the new food go away, and that it's easier just to eat it. Incidentally, please don't use dessert as a reward for eating something he doesn't like; it reinforces the negativity of the food he dislikes, and establishes dessert as something extremely desirable - not a good thing once he's old enough to choose his own foods!
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