Some recipe links, from me to you:
Also, for using up leftovers:
Fry an onion in some butter. Add 3 tbsp of flour, then slowly add half a pint of milk (I think) to make a roux. Add a "cream of" soup (chicken, mushroom, celery, etc). Then add your left over meat and veg (about half a pound or so). Put it in a pie plate and top with mashed potato, biscuits or (our favorite) a puff pastry sheet. Bake on 400 for half an hour.