Travels of cuisines

Where all our indian cuisine has travelled? One of my friend in Charlotte sampled Ethiopian themed lunch last week and had a dish called  Sambussa sounding like Samosa which we get in India. That started me on the thought that how does the cuisine gets popularised in far-flung places and what form the cusine takes in its adopted land. Essentially, If a cuisine is adopted even 50 kms away from its origin, you can expect it it be quite different than origin...sample Chat in B'lore vs. chat in delhi...Dosa in B'lore vs Dosa in Delhi..And North Indian food in Bangalore and Bay area vs North Indian food in .well..north india..