A new kind of low-cost onion storage facility, built by 19-year-old farmer Rohit Patel, may eventually come to the rescue of onion farmers across the country. Onion prices spike in the country every year — since in the absence of abundant storage facilities, the harvest perishes at the onset of monsoon. Lately for almost four months every year, onion has been selling for Rs 60 to 80 a kilo – almost taking the essential pungent vegetable off the table.