Puffed rice sounds odd. I have seen various descriptions of this. One is that this is sually made by heating rice kernels under high pressure in the presence of steam. The other is that long-grain rice grains are fried, then packed with sand and fried again. I think the result is rather like popcorn or Rice Krispies, but I am not sure what you do with the sand. I gather it has the flavour of wheat when treated in this way. I would imagine that the latter method is the one used for street-food snacks.
