You don't have to use the left overs from your roast for this one, but it really adds to the flavour if you do. It is really quick to make and if you prefer, you could add different veg to the ones listed below (Courgette, Mange Tout, Pok Choi etc).
This fed 5 children so just vary the amounts according to how many you are cooking for. Don't worry too much about exact amounts of the flavorings, it's the sort of dish you can just keep tasting and adding to as you go along.
(This is the picture before I added the noodles, hence the lack of noodles....)