batch cooking vegetables

[TeslaGirls]

Specifically red onions, peppers, brown onion, cauliflower and potatoes. I have two shopping deliveries spread out over the next 4 weeks and cant get out otherwise, so would really like to make the most of fresh veg.

Actually - is there any way of best preserving apples, oranges etc to make fresh fruit last longer - as other than freezing in crumbles I am a bit clueless! Not a domestic goddess here

[inwood]

Onions and potatoes last for ages as
Does cauliflower even the peppers will last a couple of weeks