Place flours in a large mixing bowl. Rub the 2 tbsp of oil, salt and cumin into the flour with your fingertips until it looks like breadcrumbs.
Mix water into the flour mixture and knead to form a soft dough.
Divide dough into 8 balls and roll each ball out into a circle.
Fold the circle in half and half again and roll into a circle again. Repeat with all the balls and cover with a clean tea towel until ready to fry. For a perfect circle, cut roti with the lid of a small pot.
Heat a thin layer of oil over medium heat in a frying pan. Fry roti on one side until it puffs up. Turn over and fry on the other side until lightly golden brown.
Serve as a starch with any meat dish of your choice. This is delicious with curries or as a wrap.