Persia, around tenth century AD, Abu Ali Ibn Sina, for the first time documented the recipe of Pilaf. Chelow was the starting point. To make Chelow, the Rice was to be parboiled and drained. The drained rice was then steamed to get exceptionally fluffy rice with all grains separated. The Mughal cooks often used to test such rice by dropping a fistful on ground and checking that no two grains are sticking together. Adding some spices (and not Ghee, Sugar and Cardamoms) while steaming the rice made it into Polow. Basmati rice, Sugar, many of the presently prevalent spices were very expensive in Persia which caused the Polow to taste much like salted, meaty, colorful rice; color being derived from various flowers and legumes. While the Polow traveled towards the land of spices and basmati rice, over Afghanistan, the dry fruits, sugar and spices started becoming more available; mainly due to newly discovered trading routes and increased trade(and the occasional invasions).
Arminius Vambery, a Hungarian professor of oriental languages and a traveler described the Pilaf recipe of the Afghans. A few spoonfuls of animal fat were melted (the fat of the sheep's tail was preferred) in a vessel and small pieces of sheep meat are fried and water is added and boiled till the meat becomes tender. Pepper and thinly sliced carrots are added to this and is topped with rice. As the rice boils in the water and starts cooking, some more water is added till it's fully absorbed by the rice. The pot is then sealed and hot coals are put on top and bottom. The pot is left to steam for about half an hour. After opening, it is served in such a way that all layers are separate; carrot and meat on top.
The Afghan recipe although good was too greasy and insipid to be agreeable to the Indian palate, when it traveled to India. India was transforming itself to have a religion called Hinduism. The cow had become sacred and having meat was both expensive and impious. The Mughals also adapted. Ghee was the substitute used by the Indians for anima fat. Vegetables were the substitute of meat and good rice was strictly Basmati. And thus the meat was removed; vegetables were added. Some more aromatic spices and sugar were added. The Basmati rice was colored with Saffron and turmeric. Animal fat was replaced by Ghee. The resultant metamorphosed rice is what we love to call Pulav/Polaoo.
Though I have tracked the journey of Pulav to India, it also traveled to other parts of the world. The Uzbek Lamb rice, the Lebanese Rice with lamb shank, and the humble risotto; all were derived from Pilaf. Pilaf it seems is the great grand parent of all modern recipes that constitute fluffy separated fragrant rice.
While chatting with a Lebanese Chef, the concepts of cooking the rice and Pilaf sounded so familiar that I chatted with an Iraqi and an Indian chef. The exact methods of preparation that they maintain in their restaurants remain exceptionally the same. Hardly a few percentages of difference make us all different; it's true for genetics and probably for Pilaf too.