Mix flour, oil, salt and water to make dough. Keep aside the dough by covering it with a lid for 3 hours. Meanwhile, prepare the wet dough by mixing the flour, cornflour and oil.
After three hours divide the dough into 4 parts. Then roll out each part very thinly into rotis or tortillas.
Now in each roti, spread the molten dalda on 2/3 of the spread. Sprinkle the wet dough on the roti.
Then close the roti from one to another to make a semi-circle. Then spread the dalda and wet dough again. Fold again to make a quarter shape. Repeat 2 more times so that the quarter can be as big as your palm. The quarter will layer up to become thick during this process.
Repeat for the rest of the 3 rotis. Set the 4 quarters aside for 1 hour.
Now cut out thin disks horizontally and roll with rolling pin and place on a greased baking dish. Repeat for the rest of the rotis.