The price of onion, a common item in Bangladeshi kitchen, witnessed a 557.80 percent year-on-year rise, says state-owned Trading Corporation of Bangladesh (TCB).   According to the TCB data, the price of local onion increased by 542.86 percent while that of imported one by 572.73 in November this year compared to the corresponding period of the last year.   As per the market analysis, the price hike, which stemmed from the ban India slapped on the export of the bulb on September 29, is much higher than the TCB estimation.