Heat 1½ cups of water. Add 1 cup raw mango pieces and boil for 5 minutes until soft.
Remove the mango pieces into a bowl and let them cool. Then transfer them to a mixer jar.
Add ½ cup coriander leaves, ¼ cup mint leaves, 4–5 green chilies, 1 tbsp pani puri masala, ¼ tsp hing, 1 tsp black salt, salt to taste, 1 tsp roasted cumin powder, 2 tbsp tamarind pulp, 2 tbsp jaggery, and ½ cup cold water. Grind into a paste.
In a bowl, add some ice cubes and 3 glasses of chilled water. Add the prepared paste and mix well.
Add chopped coriander leaves, chopped onion, salt to taste, 1 tbsp lemon juice, and ¼ cup fried boondi. Mix well.
Pani puri water is ready. Chill it in the refrigerator.