Onam 2023: 10 traditional dishes to add to your Sadhya feast Onam, the annual Malayali harvest festival, is celebrated during the Malayali month of Chingam.. Onam, the annual Malayali harvest festival, is celebrated during the Malayali month of Chingam. 1 / 11 Onam, the 10-day-long harvest festival, marks the beginning of the Malayalam year Kollavarshamis. 3 / 11 Erissery: Also …