Trying to gather up information about Shahjahanabad, Delhi&rsquos oldest, eternally decaying quarter, can be daunting if you aren&rsquot a document pack rat with an intimate acquaintanceship with the correspondence of colonial officers. Kothas where long-dead nautch girls were once trained might be soaked in the sweat of a thousand jalebis and festooned with the innards of television sets and grand havelis of Mughal noblemen might be filled with skittish seekh kebab-bound goats. Or, they might be guarded by self-elected bouncers, like the leaden-faced Sikh youth who stands guarding the entrance of a 19th-century dharamshala on Church Mission Road, whose T-shirt declares &lsquoYour face, my ass. What&rsquos the difference&rsquo