Thought of a few cooking ideas from when I wasn't working for 18 months after being made redundant.
If you've only a small family it's possible to make a chicken last for 3 main meals - cut legs/thighs off for roasting/baking with veg and spuds, two breasts for curry or stir-fry (curry's particularly easy to bulk out with veg, chickpeas or lentils if you need extra) and whatever's left make a stock. Add any scraps of meat you can pick off with spring onions, sweet chilli sauce, sweet corn and noodles to make a fairly substantial soup for day 3.
Mince will also go twice as far if you add red lentils to cottage pie, bolognese sauce and chilli's (not so nice in bolognese to be perfectly honest but it does the job - would probably be better turned into lasagne).
Strong cheese goes further in sauces, or if really pushed make a white sauce and just sprinkle cheese on the top before browning.
Freeze 'value' fromage frais tubs with the lids off and a lolly stick popped in - 6 ice lollies for about 50p.
'Value' cornflakes/crispies & chocolate to make crispy cakes instead of buying ready made stuff.
And then there's student food - omelettes, jacket spuds and pasta.
The irony is that both of us are working now and I'm still considering reverting to these ideas myself
. Would be an easy call to make if it was just me and DD, but unfortunately my DH rarely gets the chance to eat during the day so comes home ravenous.