I used to give DD1 a 'tasting plate' for dinner and she just ate what she wanted from it - I would do different things each day but there would be a selection of pasta, cheese, fruit, vegetables, chickpeas etc presented like an antipasto platter. She loved it but would choose to eat different things depending on what she felt like.

Now she loves 'helping' to cook dinner so involving her in the preparation also really helped her eat more - they are less likely to refuse something they have helped to make.