I cook in a school kitchen.
We serve to kids on-site and send out to another school (not yours gardeninginsummer1 )
The Tayside Contracts menu more than fulfills the Scottish Government nutritional requirements (which incidentally are more stringent than elsewhere in the UK)
The menu is based on a four week cycle, and unfortunately you seem to have been unlucky with regards to which day you were attending in that today's menu is relatively processed.
As you can probably imagine, transporting cooked pasta can be a bit hit and miss - the time between undercooked enough that it continues 'cooking' during transport and is served perfectly and ending up overdone is a small margin.
The sauce shouldn't have been watery, the recipe includes loads of chopped veg and once it's blitzed, it should be thickened if required.
The frozen yoghurt is a new item being trialled on the menu this year, and so far they've been quite popular in the 3 primary schools and 1 nursery we cater for.
Those particular pork meatballs are used, in part, because they contain less allergens than other ones (in particular, they are gluten free)
Chicken dishes are prepared using raw chicken. Steak casserole and steak pie etc use diced shoulder steak from a well-known and well-regarded butcher, who also supply the sausages, beef burgers and mince used in cottage pie/chilli/Bolognese etc. I'm not sure why you say all the meat is processed?