My DS2 doesn't eat any vegies at all. Loves fruit! Opposite to yours.
How about trying a homemade fruit smoothie or juice?
Kinder are pretty used to picky eaters, if you explain I am sure they will accommodate.
Like the other BB'ers say, just keep offering you may even find at Kinder he will want to eat what the other kids eat and give it a go. For some reason when everyone else is eating they tend to eat without realising what it is they are eating sometimes

Good luck