In a pot heat water with unsalted butter. When the water starts to boil and the butter is melted, turn off the burner. Add rice flour and mix well. Keep it covered for 10 minutes.
The mixture will look a bit dry.
After 10 minutes, knead it to a smooth dough adding water and oil. Keep the extra dough covered all the time. This will prevent the drying of dough.
Make a small ball around 2 inch diameter.
Make a flat puri with your fingers.
Add around 1/2 tbsp of stuffing.
Close the modak by pinching the sides and combining it together.
Prepare 1 batch of modak to be steamed.
Line the steamer dish with thick plastic sheet. In a steamer add water and heat it. When the water starts to boil, place prepared modaks on the plate and steam it for 15 minutes on medium heat.
Cook all the modaks likewise.