Prep the base: Add boiled black chickpeas to a large mixing bowl, ensuring they're cool and firm.
Add vegetables: Toss in chopped onion, tomato, green chilies, diced boiled potato, and pomegranate seeds.
Add mango: Mix in chopped raw mango pieces for tang.
Season: Sprinkle salt, red chili powder, roasted jeera powder, and chaat masala.
Add liquids: Drizzle lemon juice and tamarind chutney over the mixture.
Mix gently: Toss everything until evenly coated, keeping ingredients intact.
Garnish and serve: Top with fresh coriander leaves and serve immediately.