Dahi Puri (Mumbai Style)

Name: Dahi Puri (Mumbai Style)
Prep time: 45 min
Cook time: 15 min
Total time: 1 h
Cuisine: Asian, Indian
Ingredients: 2 to 3 medium size boiled and peeled potatoes; 1 small onion, (finely chopped (optional)); 1 small tomato, (finely chopped (optional)); a few sprigs of coriander leaves, (finely chopped (cilantro leaves)); ½ to ¾ cup Curd ((yogurt) or as required); ½ cup mint coriander chutney (or coriander chutney); ½ cup sweet tamarind dates chutney (or saunth chutney); ¼ to ½ cup red chili garlic chutney; 24 to 30 puris (or golgappas); nylon sev ((fried thin gran as required)); red chili powder as required (- optional); chaat masala as required; roasted cumin powder as required; black salt (or rock salt as required)