Its fair to say that 80-90% of the “ Indian restaurants’ outside of India feature the cuisine of Northern India(Particularly the state of Punjab), Pakistan and Bangladesh. And of course, they are really” South East Asian restaurants since Pakistan, Bangladesh, Sri Lanka and others are individual countries. Just think of your facourites- tandoori chicken(New Delhi) Butter chicken, saag paneer and naan (Punjab and Cahndigarh, biriyani kebabs (Pakistan and Bangladesh). There are far fewer restaurants showcasing the dishes of other regional Indian cuisines from many, many states-of course, you can sometimes find a few selected dishes on restaurant menus, particularly dishes from Goa (Lamb vindaloo and Chicken xacuti) and Tamil Nadu (Dosa and Idli). The joke in my South Indian Kerala family is “ North Indians create wonderful restaurants abroad, while South Indians typically become engineers, doctors and nurses” Majority of Indian nurses which you see around are from South Indian Kerala state. It’s the only state in India which is 100 % literacy rate with 4 international airports.