Dahi Batata Puri

Name: Dahi Batata Puri
Ingredients: 1/2 cup plus 4 teaspoons canola or vegetable oil, divided; 1 (7-ounce) package puri pellets; 2 large russet potatoes (about 1 1/4 pounds total); 1 medium red onion; 2 to 3 fresh or dried curry leaves; 2 teaspoons mustard seeds; 2 teaspoons ground turmeric; 2 teaspoons ground cumin; 1 teaspoon kosher salt; 2/3 cup full-fat plain yogurt; 1/3 cup mild or hot green chutney, such as Maazah; 1/3 cup tamarind-date chutney , such as Deep; 2 teaspoons chaat masala; 1 cup pomegranate arils; 1 cup sev (crispy noodle snack), such as Haldirams Haldiram's Plain Bhujia; 1/2 bunch fresh cilantro, coarsely chopped