Look for roasted ground cumin in your grocery store or toast and grind your own cumin seeds. Black Indian salt is a pungent-smelling lava rock salt that packs a ton of umami so a little goes a long way. Papdis are small, crisp wafers made from flour. Chaat Masala is an Indian spice blend that often flavors street food. Sev are crispy fried noodle-like snack made from chickpea flour. Look for all the above items in an Indian food market. You can do much of the prep work before and assemble last minute. The green chutney does change color if refrigerated for too long.