There is a place on Nuri Top road which is 5 km before the top. It is called Laaliyan / Laariyan ki basti. An abandoned jeep track goes up towards Saral Pass from this point but you have to actually start trek from Nuri Top road. It is very steep climb.
You can reach the top in 3-4 hours or max 5. Then it is descend all the way to Saral Lake. Total trek time could be around 6-7 hours.
Next day you can come back to Saral Top and go down to Dudipat Lake.
On third day you can go down to Besal and Jalkhad or rest day at lake, it is up to you.
The start of this route is tougher as compared to Besal route to Dudipat