They have a parent manual online - we also have a hard copy - which includes a section on food. I've copied their instructions: https://gist.github.com/pavellishin/69b9dabdd3a9ae8ecd0dce46...
(I think there's a typo there - I believe that "because we do have a commercial kitchen" should be "because we do NOT have a commercial kitchen".)
I'm going to include the list of forbidden foods here. I'm surprised that carrots and grapes are forbidden; I don't know what sort of hazard carrots present.
> NUTS of any kind. This includes nuts in cereal or baked goods.
> PEANUT BUTTER, in any form
> RAW CARROTS, in any form
> HOT DOGS/SAUSAGES link style or cut in circles. They will be served only if diced.
> POPCORN, CHIPS, SODA, CANDY, and PRETZELS are never served (except at parties).
> FRESH GRAPES are never served. In fruit cocktail, you must remove or cut the grapes.
> HARD BOILED EGGS are served only if they are peeled and cut into quarters.
> FRESH FRUIT must be peeled, pitted, and cut. One exception: bananas.
> CHERRY TOMATOES will be served only if they are quartered.
> OLIVES will be served only if pitted and halved.
> SEAFOOD is a common allergen. If there is anyone in a class that has this allergy you may be
> asked not to bring seafood.
> MEAT or CHICKEN must be removed from the bone.