Wash the mangoes and peel them.
Chop the mangoes into medium sized pieces. Discard the seeds.
Transfer the chopped mangoes to a pan.
Add a cup of water.
Cook on low flame till the mangoes are cooked and have become soft.
Now, add jaggerypowder. Keep stirring.
Once the jaggery melts, cook for 2 to 3 minutes.
Take the pan off the heat.
Allow this mixture to cool completely.
Transfer this mixture to a mixer jar.
Add fresh mint leaves and blend to a smooth paste.
To this paste, add roasted cumin powder, black pepper powder and black salt.
Blend once again for few seconds. This is the Aam Panna concentrate.
This can be refrigerated for 2 to 3 weeks.
To make aam panna, add 2 tbsp of aam panna concentrate to a glass.
Add chilled water and mix well.
Add ice cubes.
Garnish with fresh mint leaves and serve chilled.