My DS (2.5) is a huge grazer. Its impossible to get him to eat anything substantial at meal times, and I feel like he just lives on snacks (PB sandwiches, cheese, ham, fruit bars etc). He will have maybe a bite of mince or similar at dinner.

It frustrates me no end! But my research suggests that they are naturally grazers at this age, and also that their appetites are very good at regulating what they need too. I think your LO sounds fine- as long as they're not overweight, I wouldn't be concerned.

Nelle, your idea is good- give the appealing stuff at meal times. I might try this....