I'm sure I came across this idea here ages ago, but I've put it into practice lately with great success.
I use a fairycake tin to serve lunch - tiny portions in each section of cheese, carrots, ham, hummus, banana, etc.
All food the DC would eat under duress, but find boring or just not be interested, but now they munch and nibble very happily, choosing small bits at a time and keeping the food organised. :)
It takes a wee bit longer to prepare, but mealtime is much more enjoyable all around. I'm really pleased!