Soak the sabudana or tapioca in water for 3 hours. After 3 hours sabudana will be soft. Check by pressing with your finger tips. If its not soft then let it soak for 30 to 60 minutes more. I have soaked for 3 hours.
Peel and grate or mash the boiled potato.
Drain the water of sabudana completely.
In a bowl mix soaked and drained sabudana, mashed or grated boiled potato, green peas, sweet corn, mashed or grated paneer or cottage cheese, grated coconut, ginger, green chilli, chopped cilantro or coriander leaves, cumin powder, freshly crushed black pepper, salt, chaat masala powder or lemon juice.
Mix and mash well. Taste and adjust salt and lemon juice if using.
Make balls to make paratha. Small or large as you want to make your paratha. I have made 4 paratha out of this dough.
Take a ball and press with your palm. If your dough is sticky grease your palm with little oil. Or keep the dough in refrigerator for 30 to 60 minutes. I kept the dough in refrigerator for an hour.
Make a round disc by pressing gently with your palm. Heat a pan and brush little oil or ghee in the pan. Place the circle on the pan and reduce the heat. Drizzle little oil or ghee over the paratha.
Shallow fry on simmer till edges becomes brown. Flip carefully to avoid breaking. Fry the other side too till brown.
Serve hot with any chutney or yogurt.