Wash and Slice the mango, I like to retain the peel if you junk it if you like.
Pressure cook it for 10 minutes with 1 cup of water.
Squeeze the pulp out of the cooked mangoes and discard the seed and the peel if you used it.
Strain it through a large holed sieve to remove the bigger fibrous bits.
In a sauce pan, add the ghee and when it slightly hot add mustard ,cumin and asafoetida. Fry for two minutes and add the garlic. Fry till it turns slightly brown.
Add curry leaves, dry red chilli and fry for another two minutes. Add the black pepper powder, turmeric and chilli powder along with the mango pulp.
Add one more cup of water if the rasam feels too thick, lemon juice, rasam powder and boil it for 5 minutes.
Garnish with fresh coriander leaves and serve hot with steamed rice or drink it as a soup.