Heat oil in a pan. Add rye and hing. Add chopped onions and saute. Add curry leaves tomatoes and green chilli. Add turmeric powder and mix well. Add salt and mix well.
Soak the rice and dal overnight. In the morning grind them separately adding water.Blend well. Add some salt and mix well. Keep for 2 hours.. Heat a tava. Add a spoonful of the batter and make small dosas adding some oil on the sides.
Keep a dosa smear it with the potato bhaji again keep a dosa and bhaji. Repeat steps for 4 dosas. Add some melted butter on top. Serve.
