If you are lover of street food and there are several khau gallis like in Ghatkopar, mulund, vile parle, dadar.
Try pav bhaji, khada pav bhaji, falooda, chaats at girgaum chowpatty.
Have kheema pav, irani chai and bun maska at any irani cafe.
If you are non vegetarian then you must go to bade miyah at colaba.