Atkins made the potato severely unfashionable, but it hasn't become any less tasty. If you're in the mood for some rapid fire food and can't be bothered with the elaboration of a full Indian dinner, there's nothing like the potato to rescue the day. Life was much better in America, I discovered, because potatoes came in cans already boiled and peeled. Armed with that sort of weapon, suddenly a whole world of desi food opens its doors to you. There's aloo methi, aloo dum, aloo palak (yes, spinach comes in cans too) ... but nothing quite as worthy of lipsmacking dreams as aloo jeera. It's a very simple dish - even amateurs can make edible versions of it, but there's enough in it for the pro to show his tricks. And, having lived off many a can after a night of excess, I can safely lay claim to pro. The basics are straightforward - heat the ghee, pop the jeera in hot oil, toss in potatoes with enough salt and red chilli powder - and in three minutes you...