Here is the recipe of a South Indian Chettinad mushroom biryani. Chettinadu is located in the Siva Ganga district of Tamil Nadu in India. Chettinadu name itself denominates a social caste who specialises in food preparation. Chettinadu preparations are spicy and aromatic in nature. Tamilnadu Chettinad cuisine is very famous for its delicious preparations like Vegetable Chettinad curry