Do your full day care children have a 'main' meal midday, and have to eat a 'light' afternoon tea?
But your afternoon children need a more substanital meal?
Is that the prob?
then toss in the egg and dairy free?
If your midday children are eating a meal the suits the afternoon children, why not save them a meal and reheat it?
There is no rule that all children have to eat the same meal offered?
I dont know if this will suit you , as my work experience for a large day nursery we only served three meals, and insisted that the main meal was in afternoon, with a light meal or 'high tea' served in afternoon, and some children would need another meal at home with parents. I know this suited most families but did not for others.
Finding a decent cook is very difficult, I remember requesting the sacking of our cook for her poor hygeine. Nothing more disgusting than watching the cook make sandwiches with black 'half moon' fingers!!! YUK!
If you follow the above plan, i would try to get other staff to make the high tea, simple sandwiches and heating soup should be easy enough.
Might give you time to catch up on the paperwork!!