Simple method to prepare 'Set Dosa' (Uttappa)

Recently I had been to Dharwad, my aunt told me this very simple way of preparing set dosa. Usually we use boiled rice (2 & 1/2 cup), raw rice(1 & 1/2 cup), puffed rice (1 & 1/2 cup), (churmari/kadle puri) black gram (1/2 cup) & fenugreek seeds (3 tea spoons). But in this simple method only raw rice and flattened rice (avalakki) are sufficient.

Simple method :

Ingrediants :
1. raw rice : 4 cups
2. flattened rice (avalakki) : 1 cup
3. butter milk (for soaking raw rice) &
4. salt to taste.

Procedure :
1. Raw rice (4 cups) soaked in butter milk (freshly prepared);
2. flattened rice (1 cup) soaked in water
and both kept for 6-8 hrs.

Grind both together and keep overnight. Next day, add salt to taste and prepare set dosa (plain uttappa). I think, buttermilk induces fermentation. And that is why the dosa is very spongy and soft too.