When the flour has come together in dough shape, mix oil with salt. Add this mixture in the same bowl. Roll your dough in it and knead it for 15-20 mins so that it becomes non-sticky. You can knead it the way you knead your “Roti’s dough” by punching in the holes created after flattening the dough . Or you may flatten it in a rectangle, dust some flour on the counter and then tuck the opposite sides in the center , then the next pair of opposite sides to the center and repeating the steps again.