India, Sept. 10 -- Abruptly, without any prior notice, he vanished. He wasn't seen for a whole month. This afternoon, he is again sighted. Vendor Mahinder Singh is sitting at his usual spot on the pave, beside his lidded metal bucket. Where had he disappeared? Always dressed in white kurta pajama, the elderly man explains that he had gone back to his village. "It was raining very hard in Dilli, and my cold drink never sells well during the rain." The people then rarely have a craving for his offering, he says. He came back just the day before. Mahinder Singh's stall consists of the aforementioned bucket, which is currently half-filled with what he refers to as sattu ghol. This is roasted gram flour mixed with water and sugar. Sattu, of cour...