In India's sprawling financial hub of Mumbai armies of "dabbawalas" have for decades crisscrossed the city by foot and bicycle, delivering home-cooked food to office workers who are keen to avoid the searing heat and traffic-snarled streets.
Now, across the country, young entrepreneurs are taking that tradition to the next level with the explosion of shopping apps that allow customers to get hold of not only food and drink but anything else from clothes to iPhones -- within minutes.
