There are numerous ways of making Aam Panna and almost every house making it would be making it in a different way using cardamom, jaggery, chilies and so on….The below one is the one which I have been seeing in our family history.
Boil the mangoes with 6 cups of water until they are soft. You may either pressure cook it or boil it in a heavy bottom utensil.
After they are done, peel them and discard the peel. Do not discard the water.
Using the back of a ladle or hand blender, mash them to make a smooth pulp.
Add 3 cups of water and sugar/jaggery, mix till it gets dissolved.
Take few tbsp of pulp and blend the mint leaves, cumin powder, black pepper, rock salt to make a smooth paste.
Add this paste to the remaining pulp. Mix well.
Add ice cubes or chill it in a fridge before serving.
You may adjust the seasoning as preferred.