In a bowl, mix all ingredients (except the garnishing ones and oil) until well combined. Divide this mixture into 6 equal portions
Now shape each of these into smooth balls and then gently flatten them out to make tikkis, keeping the thickness to about 1 cm. Dab them in bread crumbs and coat well
Heat a shallow frying pan with the oil over medium heat and cook the tikkis, 3-4 at a time, until lightly browned and crisp on both sides
Remove on a serving plate and immediately sprinkle the black salt and the coriander leaves. Serve the sweet potato tikkis with ketchup or mint chutney