Nitsume

Nitsume is the dense, lacquer-like reduction glaze central to several branches of Japanese cuisine, most famously as the finishing sauce for grilled eel (unagi and anago) in washoku and Edomae-style sushi. In its traditional form, nitsume begins with the poaching liquid left over from simmering anago (conger eel): this collagen-rich, subtly oceanic broth is combined with soy sauce, mirin, and sake, then reduced — sometimes for several hours — over low heat until it thickens to a slow, syrupy consistency that sheets and pools. The finished glaze is painted over the eel just before serving, providing both a glossy visual finish and a concentrated hit of umami, sweetness, and smoke that complements the delicate flesh. Because the base comes from anago cooking liquid, authentic nitsume has a faint marine character absent from generic teriyaki-style glazes. Long-established sushi-ya in Tokyo are famous for maintaining nitsume pots that have been in continuous use — replenished but never fully discarded — for decades, meaning the glaze carries a layered depth of accumulated flavor that cannot be replicated quickly. Beyond eel, nitsume appears brushed onto other simmered seafood (hamaguri clam, mantis shrimp), on tamago nigiri, and as a dipping reduction for certain nimono (simmered dishes). The term is sometimes used loosely to mean any reduction sauce in Japanese cooking, but in sushi contexts it refers specifically to this eel-derived glaze.

“The sushi chef applied a single brushstroke of nitsume to each anago nigiri, the glaze catching the light like dark lacquer against the pale, tender eel.”

• glossaryNikiri
• CuisineWashoku
• TechniqueReduction

1. 1.The Japanese Kitchen — Hiroko Shimbo
2. 2.Sushi and Beyond — Michael Booth
3. 3.Japanese Farm Food — Nancy Singleton Hachisu
4. 4.The Art of Japanese Food — Masaharu Morimoto

Confidence: high