Steps (batter)
Rinse the rice, urad dal, fenugreek and poha; soak 5–6 h.
Steps (batter)
: grind smooth, then ferment 8–12 h until risen and slightly sour. Stir in the salt after it ferments.
Steps (filling)
Heat the oil. : the mustard seeds, then the urad and chana dal until golden, then the curry leaves and hing.
Steps (filling)
Add the onion, green chili and ginger; cook until the onion softens.
Steps (filling)
Add the turmeric and salt, then the mashed potato + a splash of water. Cook 2–3 min — keep it moist, not dry.
Steps (filling)
Finish with coriander and a squeeze of lemon.
Steps (dosa)
: on a hot tawa, ladle the batter and spread it thin in a spiral; drizzle ghee or oil and cook crisp and golden.
Steps (dosa)
Smear with chutney, place a line of the potato masala down the centre, and fold.