Prep the Batter
Soak rice, dal, poha, and methi for 5–6 hrs.
Grind into a smooth batter. Ferment overnight. Add salt before cooking.
Make the Potato Masala
Heat oil. Add mustard, chana dal, hing, chilies, curry leaves.
Add onions, sauté till soft. Add turmeric, salt, mashed potato.
Mix and cook for 2–3 mins. Set aside.
Crisp the Dosa
Heat a cast iron or non-stick tawa. Pour a ladle of batter, spread into a circle.
Drizzle oil or ghee on edges. Let it crisp.
Place a spoonful of masala in the center, fold the dosa.
Serve Hot
With coconut chutney, sambhar, or even just a dab of ghee.