We are nothing but the sum total of all our influences and that is true about all cuisines.
Indian food, both classically and modern, is an outgrowth of Persian cooking and New World foods. Japanese curry owes itself to British traders and an American commodore. New Orleans cuisine is based on French and African models with innovations (shrimp!) pushed by Filipino workers. Brazilian food grows out of Portuguese and African models and is reinforced by the importation of Japanese agricultural workers — the largest Japanese-speaking population outside of Japan.
Spanish cooking is based on Arabic models. In fact, most of the words for food substances have Arabic origins — aceituna (olive), azafran (saffron), naranja (orange). The word "lemon" comes from the Spanish limón which in turn comes from the Arabic laymoon which in turns come from the Chinese limung (modern-day Chinese: níngméng - 柠檬.)
Chinese food owes itself to Persian models with the extraordinarily heavy influence of Buddhism from India. Japanese food is an import of classical Chinese models. Even the language is an import of Chinese (kanji) and Indian phonetic models (Sanskrit - hiragana and katakana.)
Americans brought beef to Japan and its influence owes itself to the British Empire which in turn owes itself, ironically, to classical Persian models. The idea that meat was the food of the "rulers" not the "ruled" is based in ancient Persian hierarchical ideas about cuisine.
In the native Americas, Mexican cooking was heavily influenced by the Spanish invasion. Filipino food is based on Spanish and Mexican food because it was administered by Spain through Mexico.
Ancient Greek and Egyptian cuisine grows out of Persian models and even ancient Roman cooking is unambiguously based on Greek and Egyptian models (thanks Cleopatra!)
The CC can go on forever.
The CC can go on forever.
If one wants to look at the truly ur-models then it would be the Babylonian and after that Persian models (wheat, barley) because that's where the crux of all political organization (and hence cooking) began.
So whither authenticity?
All food is ultimately fusion. It just matters how far you go back and look.
That's because humans have been trading with each other for millennia and good ideas have a way of germinating in other places and great ideas spread fast.
The traders were the original internet.
The Chinese traders taught the Indians how to steam circa the 10th century. The British brought curry powder to the Japanese and the French. The French brought classical technique to Haiti and New Orleans.
So anytime someone complains about "fusion", the CC just goes "Huh?!? What are you smokin'?"
For the record, even marijuana has Persian origins. Quelle surprise?