Masala Dosa: Fermented Batter, Crisp Shell, Spiced Potato Filling

Soak rice (with fenugreek seeds) and urad dal separately in cold water for at least 6 hours. The fenugreek goes with the rice.

Drain the urad dal. Grind it in a blender with 100 ml cold water, adding water slowly, until the batter is very smooth, light, and airy — about 5 minutes on high speed. It should double in volume while grinding. Transfer to a large bowl.

Drain the rice. Grind it with 150 ml cold water to a slightly coarse batter — not fully smooth. Combine with the dal batter. Add salt. Mix thoroughly, cover with a cloth, and ferment at room temperature for 8–12 hours until the batter has risen and small bubbles cover the surface.

Make the potato filling: heat oil in a pan over medium heat. Add mustard seeds and let them pop (15 seconds). Add curry leaves, then onion and green chili. Cook 8 minutes until golden. Add turmeric and salt, then fold in the mashed potato. Stir to combine. Add coriander. Keep warm.

Heat a cast-iron tawa or flat non-stick pan over high heat until extremely hot. Rub the surface with the cut onion half, then drop on a few drops of oil and wipe with a cloth or paper.

Pour a ladle of batter (about 80 ml) in the center of the pan. Using the back of the ladle, spread in a confident circular motion from the center outward to make a thin circle about 25 cm in diameter. Work quickly — the batter sets fast.

Drizzle a few drops of oil around the edges and on top. Cook over medium-high heat for 2–3 minutes until the edges begin to crisp and lift, and the surface looks dry with no wet spots.

Place 2–3 tablespoons of potato filling along the center of the dosa. Fold one side over the filling (or roll into a cylinder). Remove from the pan. Serve immediately with coconut chutney and sambar.