In a large mixing bowl add rice flour, urad dal flour, a large pinch of asafoetida, salt, white sesame seeds and melted butter. Mix well.
Make a well in the center and pour hot boiling water as needed.
Using a ladle, mix the dough as much as possible. When it begins to come together, stop adding any more water.
When the dough is warm enough to handle, mix it well using your hand until it is smooth.
Meanwhile heat oil for deep frying. Fill the dough in the Murukku press.
Gently press the Murukku on the backside of a small plate or ladle. Make two or three Murukku at a time, making sure it is not too thick or with many layers.
When the oil is hot, set the flame on medium and gently drop the pressed murukku 2-3 at a time.
Fry them on medium flame until there are no more bubbles in the oil and the murukku looks pale golden.
Drain the murukku onto a tissue paper and repeat the same with rest of the dough.
Store the prepared murukku in an air tight container once they are cooled down. Serve with coffee/tea or as snack any time of the day.