Dry roast urad dal and make a fine powder and keep it ready.
Take a large vessel add rice flour ,urad dal flour, hing,jeera,needed salt and butter.
Mix well then add coconut milk to form a dough.
Heat kadai with oil.
In-between grease murukku press stuff this dough.
When hot you can squeeze directly in oil or on a greased surface then drop it in oil.
Adjust the heat then and there.
When sizzling sound subsides take out in a tissue and store.
Notes
Cook well so that the insides are well cooked.
Adjust the flame accordingly.
This murrukku remains white not brown.
While mixing the dough make it perfectly so that it does not break while squeezing.