So, it is entirely possible that rice-based dishes such as the pulao too travelled from ancient India to Persia and Greece (both conquered and reconquered by each other) and became firmly a part of their cuisine histories. Certain historical records suggest that the word pulao, in fact, traces its roots from the Sanskrit word "Pulla" (meaning rice and meat). If we believe this theory of how the pulao travelled, ironically enough, it would seem that it was reimported back to India from the Central Asian world of the Mughals and before that of the Turkish-Afghan rulers in the Subcontinent before it became firmly a part of our own national cuisine(s).
One of my Greek friends once cooked the pilafi for me. To me, it seemed almost the same as my own family's version of the Yakhni Pulao. One of the older dishes of northern India, the Yakhni Pulao - rice cooked in goat meat stock and whole spices - is a Kayastha special, representing northern India's rich Ganga-Jamuni, Indo-Islamic culture. It is a dish that got into the community's repertoire due to the proximity of the scribes with the Mughal courts. And it clearly shows up the way the pilaf travelled to India-from its Persian and Persian-influenced homelands to the Subcontinent with the travelling retinue of cooks and wives of the Delhi emperors.
Rice & Its Varied Preparations
What distinguishes a pilaf/pulao from other rice-with-spice preparations like our own khichdi or rice gruels is the separation of the grains of rice. Each grain has to be separate and flavourful, cooked as it is in just enough stock to let it cook fully without getting mushy. So any rice dish which is cooked with meat (with other additions depending on the terrain and culture it belongs to) and where the grains are separate is technically a pilaf/pulao.
The Persians/Iranians, of course, have a huge repertoire, adding bits of pistachios, orange water and zest and saffron (the hallmark of the cuisine) and many different kinds of meats, including fish, lamb and beef to the pilaf/pulao.
As the pilaf/pulao travelled to India, it gained in spices and seasoning. Yoghurt of the Indo-gangetic belt replaced lemon/orange as the souring agent for the meat and flavours got bolder. So my family's Yakhni Pulao recipe involves first making stock with meat, onion, ginger-garlic and whole spices like bay leaf, black cardamom, peppercorns, cloves and cinnamon. Fennel, interestingly also a Greek/central Asian spice, is particularly added in some recipes of the pulao. The stock is reserved and the meat further browned in fat to intensify flavours before rice is added and the meat and rice allowed to cook fully together in the stock.
The pulao of Delhi evolved into the many biryanis of India, where higher levels of spices were added, including khus khus, copra and sesame in Hyderabad. The biryani was also created by layering the rice and meat (which could be pre-cooked or kachcha) and that sets it apart from the pulao. But it is also true that the pilaf/pulao is a much more subtly spiced dish than the biryani.
If you know the histories of these dishes, you would of course understand why there are no real vegetarian pulaos and biryanis. The Afghan pulaos - Kabuli Pulao as it is called - use vegetables like carrots and dried fruit like raisins to offer contrasting flavours of sweet and saltiness. But these are in addition to meat. The main flavour of the pilaf/pulao and indeed the separation of its grains comes from stock made with meat.
The tehri, on the other hand, is the vegetarian cousin of the pulao in the Subcontinent. A dish made using fresh seasonal vegetables and rice. But that is a separate story.
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