As much as tasting authentic street food appeals, its really not a wise move if your not from the country, what with whe waterbourne bugs, they can make you really ill.
And Delhi isn't all like the video, I was there in february.
A street seller of oranges, cows and monkeys


Random food sold at India Gate, Delhi

The local take away

Popadums sold from a litter bin

That said, I really enjoyed being out there and I have asked to do a 2 year work secondment out there... I really like the place.