There's something magical about charcoal. Light it up slow, put pretty much any foodstuff on it and you'll soon have a line of people trying to persuade you to take their money. There's the ubiquitous corn cob (American or desi), roasted on the coals and then lathered with butter and nimbu. Then there's peanuts, seekh kakabs and fifty other parts of lamb or cow, all calling out to you at every corner. Charcoal, in particular, goes well with simple things - potatoes, aubergines, chestnuts - imparting a smoky, slow-cooked flavour to convert otherwise dull stuff into comfort food like no other. Some treats, however, are seasonal and harder to find; it was sheer fortune that I found two of these in the same week on the streets of Mumbai. Both are very distinctively Mumbai - I haven't really seen them being sold in this manner in other Indian cities. The first is green chana. I'm not really sure if it has anything to do with normal chana but it looks like hairy pe...