Negima Nabe Leek and Tuna Winter Hot Pot

Edo period Tokyo (18th century) — fishermen and fish market workers' working-class nabe; tuna was the least valued fish in Edo due to rapid deterioration; negima nabe became upscale as tuna became premium through refrigeration technology

Negima nabe is a traditional Edo-period Tokyo hot pot in which fatty bluefin tuna (specifically the fatty belly toro and medium-fat chu-toro cuts) is simmered with negi (Tokyo long green onion—long-stemmed, with thick white stalk and relatively narrow green top) in a seasoned dashi broth. The dish emerged in Edo (Tokyo) during the 18th century when bluefin tuna—now the world's most expensive fish—was considered an inexpensive, low-status ingredient because its fatty flesh deteriorated quickly without refrigeration; tuna was the food of working-class Edo citizens, not the wealthy samurai who preferred the delicate white fish considered refined. The name combines 'negi' (green onion) and 'ma' (inside or between)—the onion placed inside and between the tuna pieces. The transformation from historical peasant food to modern luxury food represents one of the most dramatic status reversals in world food culture: a dish originally eaten by dockworkers and market porters is now served at premium prices in Tokyo restaurants specialising in historical Edo cuisine. Negima nabe's flavour logic is sound regardless of price: negi's sweetness and slight sulfurous bite perfectly balances tuna's oceanic richness.

Fatty tuna richness; sweet caramelised negi; clean dashi-soy broth; the combination of ocean richness and vegetable sweetness is perfectly balanced — historically humble, now a luxury dish