Wash the potatoes thoroughly and cut them in half. Pressure cook until soft.
Peel the skin off the cooked potatoes and mash them well using a fork or masher.
Grate the coconut and set it aside.
Heat oil in a kadai. Add mustard seeds and allow them to splutter.
Add urad dal and chana dal. Sauté until golden brown.
Toss in chopped green chilies, curry leaves, asafoetida, and salt. Sauté for about 30 seconds.
Add the mashed potatoes to the tempering and mix thoroughly. Adjust salt if needed.
Garnish with freshly grated coconut and mix gently.
Turn off the heat and squeeze fresh lemon juice over the podimas.
Serve hot as a side dish with sambar rice, rasam rice, or any South Indian meal.