£15 for a week's food, what would you buy/make?

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Just found out a client I work with has £15 to last for a week's (well, 8 days actually) meals and I have to go shopping with her tomorrow to buy as much as possible but I'm blank on what to get. For info's sake she has a cooker and a microwave so enough cooking facilities but very very little in the way of staples - salt and maybe a bit of sugar, no herbs etc and pretty much no other food. She's not long had a 3rd foodbank bag so not sure she can go to them again yet. Can't get an advance payment on benefits yet due to something complex holding up making an application.

What would you buy and what meals would you make? (and to be absolutely clear, this isn't for me and I absolutely can't take any sort of donations so am not trolling/soliciting for anything)

My local market sells a sack of potatoes for £2 - do u have local market ??
Cheap pasta
Also rice with fried onion and but frozen sweet corn is v cheap
Farm foods sell packs of things 3 for 2 eg y day I got three bags frozen veg for £ 2
The quorn in there was 2 pounds serve s 6 but may not be any good without flavourings if she has non
Local church may help ?

Just saw what par nish said - yes market reduces fruit to pennies at end of day.

UHT milk cheap, as is lard, bag of plain flour for 45p useful to make pancakes/bread/pizza et

Asda do a decent bag of frozen chicken portions of 1kg for £1-60 that is good value

I've done my family of 5 on £10 for a week before so will be OK but boring, would recommend a bottle of cheap squash and pack or two of cheap biscuits to stop the feeling too deprived