Wash the mangoes and keep it ready.
wash and cut the cucumber, scoop and discard the seeds.
Wash and pressure cook the dal and cut cucumber on medium heat ( 2 whistle are enough) along with turmeric powder and 2 cups of water.
Grind coconut and rasam powder along with water to a fine paste.
Remove the mango skin and keep it as whole mango in a pan . Keep the peels in a plate.
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Add water and extract all the remaining pulp from mango peel.
Add this water to the peeled mango. Add the grind masala. Add water to the mixer jar, add this to the pan.
Once it just stars boiling, add the cooked dal and cucumber , add salt, jaggery and curry leaves, allow it to boil on medium heat for 5 to 8 minutes.
Turn off the heat and garnish with chopped coriander leaves.