Indian food expert Vandana Verma hunts down Mumbai’s food staples, from family-owned Gujurati canteens to street stalls hawking ‘Bombay Sandwiches’, via the best ‘vada pav’ in the city – spiced potato balls mixed with coriander, garlic and chilli deep-fried in chickpea batter. Vandana also tracks Mumbai’s dabbawallas, the army of couriers who ferry tiffin lunch boxes from the kitchens of homes to offices across the mega-city.