Soak rice, dal, fenugreek for 6-8 hrs; poha for 30 mins. Grind with water to smooth batter. Ferment 8-12 hrs until doubled. Add salt before cooking.
Mash potatoes. Heat oil, splutter mustard, add cumin, urad dal, curry leaves. Sauté onions, chilies, ginger. Add potatoes, turmeric, salt. Cook 3-4 mins. Garnish.
Cook veggies. Add dal, sambar powder, turmeric, salt, tamarind. Simmer 10-15 mins. Temper and garnish.
Blend coconut, dal, chili, ginger, salt. Temper and pour over chutney. Serve with dosa.
Heat a pan or tawa with a touch of oil: Pour a ladleful of dosa batter onto the hot pan and spread it into a thin circle.
Cook until crisp: Drizzle oil or ghee around the edges. Cook on medium heat until the dosa turns golden and crispy.
Add filling: Place a spoonful of the aloomasala filling in the centre, fold the dosa, and serve hot.
Serve with: Sambar and coconut chutney.
