For Dosa Batter
- Soak rice, urad dal, poha, and fenugreek seeds in water for 6-8 hours.
- Drain and blend the soaked mixture into a smooth batter, adding water as needed.
- Add salt and let the batter ferment overnight or for 8-12 hours.
For Potato Masala Filling
- Heat oil in a pan, add mustard seeds, and let them splutter.
- Add cumin seeds, curry leaves, and green chilies, and sauté for a minute.
- Add sliced onions and sauté until golden brown.
- Add turmeric powder and mashed potatoes, mix well.
- Add salt to taste and cook for another 5 minutes.
- Garnish with chopped coriander leaves if desired and set aside.
Making Masala Dosa
- Heat a griddle or non-stick pan over medium heat.
- Pour a ladleful of dosa batter onto the centre of the pan and spread it in a circular motion to form a thin crepe.
- Drizzle a few drops of oil around the edges.
- Cook until the edges start to lift and the bottom turns golden brown.
- Place a portion of potato masala filling in the centre of the dosa.
- Fold the dosa over the filling and serve hot with coconut chutney and sambar.