There is a lovely explosion of flavours and textures in the Matar Chaat recipe that you shared. The recipe for Matar Chaat can be found here.
For the peas:
2 cup dried white peas (safed matar)
3 cups water (for pressure cooking)
Salt to taste
1/2 tsp turmeric powder
1/2 tsp red chili powder (optional)
For the chaat:
2 small onion (finely chopped)
1 medium tomato (finely chopped)
1 green chili (finely chopped)
1 tbsp green chutney (mint-coriander)
1 tbsp tamarind chutney
1 tsp roasted cumin powder
1/2 tsp chaat masala
1/2 tsp black salt (kala namak)
Juice of 1/2 lemon
Handful of chopped coriander
Sev (optional topping)
Curd- ½ cup
Paapdi
Instructions for Matar chaat receipe:
Soak the dried white peas overnight (or for at least 6–8 hours). Pressure cook with turmeric, salt, and water for 3–4 whistles or until soft but not mushy.
Prepare the chaat In a mixing bowl, take 2 cups of cooked peas (drain extra water if needed).
Add onion, tomato, green chili, and ginger, curd. Mix in green chutney, tamarind chutney, lemon juice, cumin powder, chaat masala, and black salt.
Mix well and adjust salt or spice to taste. Top with chopped coriander, paapdi (made by white flour which seems crunchy), and pomegranate if using.
Garnish with curd, tamarind chutney, green chutney and paapdi. Serve warm or at room temperature.