In Biryani, boath the meat/vegetables and rice are cooked separately and then they are layered and baked during cooking. The process also lives up to the name Biryani in Persian meaning 'fry before cooking'.
In Pulao, the 'meat/vegetables and rice are stirred' before cooking and both are cooked together without any layer formation.
Tehri is a vegetarian dish prepared by cooking rice with potatoes. Other vegetables may also be added to it. It is common in Uttar Pradesh, India.
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