Peel the skin of the mangoes and put them in a pressure cooker.

 Add enough water to cover them and cook till soft. (One whistle on high and 2 on low). Remove the pressure cooker from heat and let the mangoes cool down

 Mash the mangoes to take out all the pulp. Do not discard the water.

Add 5-6 cups of water in the existing water.

Grind the mint leaves with little water to make a paste. Add ground mint, sugar, cumin powder and salt to the mango pulp mixed with water

 Mix well to dissolve the sugar. Adjust sugar and salt according to your taste. Add more water if required. Chill it for a few hours before serving