In a grinding jar, add rava, wheat flour, curd and water. Make a smooth batter.
Take out batter into mixing bowl and rest it for 10 minutes so rava will puff up.
After 10 minutes, add the required water to make dosa batter and mix well.
Then add salt to taste and pinch of baking soda. Mix well.
Now heat a tawa, grease it with oil and with wet cloth cool down the temperature of tawa.
Take 1-2 ladles of batter and spread it on tawa.
Apply butter to the dosa and roast the dosa on medium flame.
Roll the crispy dosa and serve hot.