I think the Most Popular Indian Food is Butter Chicken, if you ask why then you must open youtube & write Indian Food. You will come across gazillion videos of people around the world trying Indian Food. The most common thing between the food they will eat will be this Dish known as “Butter Chicken”. The Other dish you will find is “Chole & Naan” that is made of Yellow Grams eaten with Chapati or Naan. Other can be “Biryani” made with Rice & Chicken or Mutton, “Palak Paneer” made of Spinach curry with Indian Cheeze, and “Dal” Thats Indian Lentil which we normally eat with Rice on regular Day. South Indian Food is also quite Popular like Idli, Dosa, Vada which we eat with Sambhar.