In a pressure cooker, add rinsed urad dal and water. Pressure cook for 5 whistles. Let the pressure suppress automatically.
Once the pressure releases, open the lid, transfer the cooked urad dal to a sieve to filter the excess water. Save the water to make the dough in later point of time to make dough.
Cool down and Grind the urad dal into a smooth paste. Add this paste to a mixing bowl.
Then add rice flour, cumin seeds, sesame seeds, salt and melted butter.
Add the saved urad dal cooked water slowly by sprinkling over flour and make a soft and smooth dough.
Divide the dough into equal-sized logs or cylindrical shape.
Coat the murukku press(murukku achu) with oil. Insert dough into it, and press it to make murukku.
Meanwhile, heat oil in a heavy bottom kadai and transfer uncooked murukku to it one by one using a spatula when it is hot. Deep fry in batches until it just started changing in color.
Cool down to room temperature and store it in an air tight container. Repeat the process until the dough gets over.