Bangladeshi food eateries like Kasturi aren't the only reason people head to Free School Street. The popular Bangla joint The Bhoj Company (opposite the Art Deco-style Fire Brigade headquarters) draws people to that area for its excellent Bengali and Dhakai cuisiney. We love the kochu pata diye Ilish bhapa and the bhetki paturi and kachki macher chorchori. This is the original one and is a tad small but they have another bigger outlet at Dalhousie.
