I never had school dinners, but once had to go to the dining hall, it smelt vile in there, spring cabbage complete with flies. I would never have been able to eat there. For the cheese and egg flan you would need a pastry base in a sandwich tin baked blind, two eggs beaten with milk (about half a pint altogether) season with salt and pepper, sprinkle 2 oz of grated cheese or more if you wish, on the bottom of the pastry base, I sometimes add some cubed peices of ham, then pour on the egg mixture, you could thinly slice some tomato and lay on top of the egg mixture to give it colour. Put in oven Electric 180 Gas Mk 5-6 Bake for about 30mins or until egg is risen and browned. You'd have to bake the pastry case blind before adding the ingredlents. If you want cheese and onion lightly fry and drain the onion first before putting it in the flan,