First wash and soak sabudana in minimum water for an hour or more.
Meanwhile knead the dough with rajgira atta and rock salt with warm water, to make cones.
Cover the dough and keep aside. Rest it for 10 minutes. Divide the dough in 2 equal parts.
Roll one dough ball in round shape in between two plastic sheets. As rajgira atta is difficult to handle, take care while rolling it and moulding it.
Remove the plastic sheets. Then cut the round chapati in 2 halves with knife.Take one half and roll it like how we make samosa cover or cone.
Like this method, in all make 2 round chapatis, cut it in half and roll like samosa cover/cone.
In this way you will have 4 cones.
Now bake/deep fry rajgira cones. Heat the oil and after that lower the flame.
Take one Cone and put the open side of Cone down in the oil first.
Let it fry on that side for few seconds and after that turn it in the oil and deep fry on all the sides. Likewise fry all 4 cones one by one.
Drain this on tissue paper.