Mix avva (mustard powder),red chili powder, salt, fenugreek seeds and oil with mango pieces and keep aside for 4 - 5 days.Separate the mango pieces from the mixture and sun dry them separately till the mango pieces dry well.
Make jaggery syrup and bring to room temperature.
Mix the syrup with mixture.
Cut the mango pieces into small pieces.
Add the mango pieces with the base and mix well.
Mix thoroughly and let cool. Save in an air tight container.