Japan (created in early 20th century Japanese Chinese restaurants in Tokyo or Osaka; not a Chinese dish despite the Tianjin name)
Tenshinhan (天津飯, 'Tianjin rice') is a uniquely Japanese-Chinese dish that does not exist in China but is ubiquitous at Japanese Chinese restaurants (chūka ryōri) — a soft, barely-set egg and crabmeat omelette served over rice and drizzled with a thick, sweet-savoury starchy sauce of soy, vinegar, and chicken stock. The name claims Tianjin as the dish's origin, but it was created in Japan (most likely Tokyo or Osaka) in the early 20th century as a Japanese interpretation of Chinese egg omelette dishes. The egg preparation is central: the eggs are beaten with seasoning and crabmeat (or crab floss, canned crab, or imitation crab), then cooked in well-oiled wok or pan with a circular motion to create a round, very soft, barely-set omelette. The omelette must remain soft and almost runny in the centre — Chinese cooking technique at its most demanding for egg texture. The sauce is either sweet-sour ankake (vinegar-forward) or oyster-sauce-based (richer, less acidic), ladled over the omelette and rice. Tenshinhan is comfort food at Japanese Chinese restaurants across the country — inexpensive, deeply satisfying, and available at every rámen and chūka restaurant.
Soft, eggy, mild crab sweetness; sweet-sour ankake sauce or richer oyster sauce; the sauce-rice combination is the dish's core pleasure
{"Soft-set omelette: the eggs must remain tender and barely set in the centre — a Japanese version of Chinese egg technique","Wok high-heat circular pour: the eggs are poured in a circle in a very hot oiled wok for the round shape","Two sauce options: sweet-sour ankake (vinegar-forward) vs oyster sauce-based (richer)","Crabmeat quality affects outcome: real crab produces best result; imitation crab is the affordable substitute","Rice service: the sauce must be poured directly over both omelette and rice for full integration"}
{"Beat eggs vigorously before adding to hot oil — the air incorporated helps produce the light, pillowy texture","Add 1 tsp sesame oil to the egg mix before cooking — improves aroma and adds Chinese character","The sauce amount is generous by Japanese standards — the rice absorbs it, and that's the point","For sweet-sour ankake version: balance vinegar and sugar carefully; the tang should be forward but balanced"}
{"Over-cooking the egg — the centre must remain soft; tenshinhan with a dry, fully-cooked omelette loses its identity","Sauce too thin — it should coat and hold; thin sauce runs off the omelette and fails to integrate","Insufficient oil in the pan — the round omelette shape requires the egg to skate on hot oil; under-oiling produces sticking","Stacking omelette too high — flat-ish, wide omelette allows the sauce to reach all surfaces"}
Richie Donald, A Taste of Japan