Biryani is prominently a dish of Nizams. Rice being the more staple food of South India, It has more varieties of Biryani. Particularly, Hyderabadi biryani originated as a blend of Mughlai and Irania(Indian Rice Recipes)
Ferni is Indian/Pakistani rice pudding and adding dry fruit and kewra water in it makes it Shahi Ferni. Chill it nicely before serving, it will taste best.