Grind cooked green gram to fine puree along with 1/4 cup of water. Transfer it to a bowl. Then grind grated coconut, cumin, asafoetida and green chillies to fine paste adding very little water.
In a wide bowl add rice powder,coconut plus spice puree, salt and split green gram paste. Combine everything well in to slightly thick dough. You wouldn't need any additional water for this dough as cooked lentils have enough water in it.
Next take the murukku press with the kara sev plate and fill it with the prepared dough. Grease two plastic squares with some oil and squeeze in layered murukku in circular manner. Do not over do layering which won't get cooked easily.
Heat oil in wide wok and when the oil is rightly heated, carefully slide the squeezed murukku in to hot oil. Let it cook in medium flame till the color turns towards light brown. Flip in between for cooking both sides evenly. When the sizzling and sh.. sound ceases remove the murukku from oil using slotted ladle.
Repeat the process to finish the dough. Crispy snack moong dal murukku is ready for Diwali.