In northern India they're known as "panipuri"; people in Bangladesh call them "fuchka." When the little balls of dough are deep-fried they puff up. Then they are opened up carefully and the hollow center is stuffed with vegetables, meat or fish.
We met up with Mohammed on Nilkhet Square in the Bangladeshi capital Dhaka. The fourteen-year-old boy mans his own fuchka stall to earn money for his family.