Sorry but I've no secret tips! Just made sure that they ate what we ate and that we tried from an early age to introduce them to as wide a range as possible. Getting them to eat sushi for instance was relatively easy because of the novelty of how places like Yo Sushi are laid out. Kids love all...
I guess I'm lucky because I found it easy feeding my kids. The only rule I had was that if we were eating out at a restaurant or pub then they'd order from the adult menu and never from the kid's menu. When they were much younger it did mean that a lot of food got left but rather that than them...