I always make up double SW chips to the par boiling then bag half and stick them in the fridge.
I also chop BNS and have that ready (so if you have chips I also have roasted BNS for the SF element)
When making homemade burgers I make double patties and freeze them wrapped in greaseproof paper.
I have a tin of Chick Pea Dahl in the cupboard too.