Negima

The name negima is older than the chicken skewer and originally had nothing to do with poultry: it comes from negima-nabe, an Edo-period (17th–19th century) hot pot of negi (scallion) and maguro (tuna), and the 'ma' is the 'ma' of maguro, not the word for 'gap' or 'between' as is often assumed. When fatty tuna belly was cheap, this scallion-and-tuna pot was common Edo fare. The grilled chicken version is far more recent: it is generally traced to the postwar period, when tuna grew scarce and expensive — bound for sushi and sashimi — and grilled chicken came to fill the role on the skewer, with leek standing in for the scallion of the old pot. The original tuna negima survives in some places as a hot pot, but the chicken-and-leek skewer is what the word now calls to mind across Japan.

Bitten off the skewer, the chicken thigh is juicy and a touch chewy with crisp, rendered skin, while the leek between each piece turns silky-soft and sweet, almost melting, its raw sharpness cooked away into a mild oniony sweetness. The charcoal leaves a smoky char on both; the tare version coats everything in a glossy, sticky, sweet-salty lacquer, while the shio version stays cleaner and lets the chicken and the charred leek read clearly. The contrast of firm meat against soft, sweet leek in the same mouthful is the whole appeal. Overcooked, the thigh dries and the leek collapses to mush; undercooked, the leek stays harsh and raw.

Chicken thigh is chosen over breast because its higher fat and connective tissue keep it juicy over direct fire, where lean breast would dry out; threading it skin-side out lets the subcutaneous fat render and the skin crisp through dehydration and browning against the radiant heat. The leek is cut to roughly the same length as the chicken pieces so both cook in step; its sharp raw sulfur compounds break down with heat while its natural sugars concentrate and brown, turning it sweet and soft. Tare — soy sauce, mirin, sake, and sugar simmered down — is brushed on in repeated coats over the coals, where its sugars and amino acids brown through the Maillard reaction and caramelization into a sticky, aromatic glaze; the smoke from fat dripping onto the charcoal adds further aroma. Charcoal is preferred to a gas flame because its intense radiant heat sears the surface fast while smoke perfumes the meat.