Decided to make it easier on myself and give the children a self-serve lunch - cold cuts, cheeses, crackers, fruits, and nuts. They thought it was glorious. Not sure why it took me this long to come up with such a basic idea!
It was gratifying to see them consider one another, asking if they could take the last piece and graciously assenting to each other.
They tried more foods than usual - my 8 yr-old even said "salami tastes better than I thought it would" and my son took tangerine (not his favorite) because of the creativity that buffet style eating sparked.
They didn't have to keep asking for seconds, thirds, etc., yet they seemed to know when to stop eating.
The next step is getting them to assemble the buffet...judging from my track record, that will happen by the time they're teens ;)