This brings to my mind the entire scenario of having 'tiffin' or lunch at our offices. To think of it, this need has lead to a whole sub-economy in India. I do not have the experience of working in any other city in India other than Kolkata - so my experience is restricted to Kolkata itself and that is what I will write about here.
Now we all know almost any Bengali can is invariably a 'bhojon-roshik' (rough translation: food afficianado). We Bengali's sure do enjoy and know our food. And since more than half the time in a typical day is spent at office, office 'tiffin' or lunch becomes a life saving necessity...
Before the fast food and eating out revolution hit us, most people used to carry lunch from home (many people still do now, but I believe the percentage has gone down). Now of course, there are various options available - be it the office canteen, street food, restaurant take-aways and such alike.
Office canteens are for the more conservative at heart - they dish out the regular Bengali 'thaali' or multi-course meals. Typical meal would consist of a rice and/or roti, some vegetables (in most days heavily dominated by the cheapest vegetable available - potato), fish or chicken curry and a 'mishti' (Bengali sweets) or doi (yoghurt - made the Bengali way).
Now many people are constantly driven by the spirit of adventure and innovation - and the above staple fare served at office canteens will not satiate their taste buds. That is where the street food of Kolkata comes into the picture.
The two places in Kolkata who have earned their fame in this regard are Decars Lane and Camac Street, especially the former. In both these places you would find an amazing variety of food available - bengali, north indian, south indian, "chinese" (thoroughly Indianised) and also what is proclaimed as 'Continental' (stews and such alike). The requirements from most people eating in these shops are primarily how filling the food is (the quantity), how cheap the food is and also how quick the 'service' is. The though of pristine hygiene is something which one will have to forego if eating at these places.
Another late entrant to the Kolkata lunch scene is the 'dabba' - now 'dabba' in Kolkata is not what is meant by 'dabba' in Mumbai. In Mumbai the 'dabba's contain food is home-made and is then to an individual at his work place. In Kolkata the 'dabbawala' delivers food which he has made/procured himself.
In this regard I should mention the lunch scenario in the IT industry belt of Kolkata (primarily Sector V, Salt Lake). Here the situation is a different because there are very few restaurants in this area. Most people either bring food from home or have it in their respective office canteens. But there are two more options - firstly there are some vendors who bring in food in mobile vans. They come in at lunchtime - serve the food out of the car/van and then leave. There are also a number of semi-permanent structures - they are referred to as 'jhhupri' in Bengali ('jhhups' is a recent trendy name :-)). These 'jhhups' normally have steaming hot rice, 'daal' & fried fish on the 'menu' - the hygiene bit of course leaves a lot to be desired.