Heat oil in a pan, add 1 cup potato pieces and 1 cup sweet potato pieces. Fry them on medium flame until slightly crisp, cooked to about 80%. Remove onto a wire rack.
Next, fry 1 cup brinjal (eggplant) and 1 cup cauliflower separately. Remove onto a wire rack.
In a pan, add ½ cup oil. Then add 1 tbsp cumin seeds, 1 tsp ajwain, 1 bay leaf, 1-inch cinnamon, 4 cloves, 1 star anise, 2 dry red chilies, and ½ tsp hing. Sauté.
Add 1 cup onion paste and sauté it.
In a blender, grind 2-3 green chilies, 2-inch ginger, ½ cup green garlic, and ½ cup coriander leaves without water. Add the prepared green paste into the kadai and sauté till the oil separates from its sides.
Reduce the flame, add ½ tsp turmeric powder, 3 tbsp coriander powder, 3 tbsp red chili powder, 2 tbsp undhiyu masala, and some hot water. Sauté the masala till the oil separates.
Then add 1 cup tomato puree and salt. Cover and cook the gravy till the oil separates.
Add boiled papdi and dana into the gravy and mix well.
Now add the fried vegetables and mix well.
Add 2 cups of hot water and mix well.
Now add the muthiya and 3-4 crushed muthiya into the gravy. Mix well.
Cook it on medium flame for 5-7 minutes, allowing it to absorb all the flavors from the gravy.
Then add 1 tbsp jaggery, 1 tbsp lemon juice, and some coriander leaves. Mix well.
Serve the spicy Tavo (Undhiyu) with chapdi.