In all Punjabi households - even if you have run out of lots of ingredients to make dinner with - there is always a bare minumum of stuff in the cupboard that can be used to knock something up in an emergency. And that bare minimum is potatoes and onions - and preferably also some green chillie peppers - preferably the long green ones that you can get in any Asian grocer shop - and they keep for ages in the fridge too. (Well a week or so at least). Here's what you'll need to make this fine-tasting accompaniment to a main meal - or indeed can be eaten alone as a sort of midnight snack if you're that way inclined