Slice the papaya into 2" length and 1/4"width pieces. Apply the salt on the sliced papaya pieces and keep it for 1hour. Grind the 3rd ingredients finely with little water.
Heat the gingelly oil in a pan and season the mustard and fenugreek. Add the turmeric powder and sauté for a while. Add garlic. When it is half sautéed, add the dry chillies. Put the ground ingredients and saute well. Pour the warm water and when it boils, add vinegar, lemon juice, sugar and salt. When the gravy thickens, remove from fire and allow to cool. Add the papaya pieces and the mustard seeds into it. Stir well.