Overview

Freshwater eels are catadromous fish of the genus Anguilla, meaning they live in freshwater rivers, lakes, or estuaries as adults and return to the ocean to spawn. They have a rich, fatty flesh with a sweet, clean flavor and a tender but firm texture. In Japanese cuisine, the species most commonly used is Anguilla japonica (Japanese eel, unagi), prized for its high fat content and ability to absorb sweet-savory glazes.

Origin and history

The genus Anguilla is distributed across temperate and tropical waters worldwide, with species native to East Asia, Europe, North America, and Oceania. The Japanese eel (Anguilla japonica) has been consumed in Japan for centuries, with unagi (freshwater eel) becoming a seasonal summer food believed to combat fatigue and heat exhaustion. The Edo period (1603–1868) saw the development of kabayaki, the lacquered grilled preparation that remains the standard. Wild eel populations have declined sharply due to overfishing, habitat loss, and changes in ocean currents affecting larval survival, leading to aquaculture efforts that still rely on wild-caught juveniles (glass eels) for stocking.

Varieties and aliases

  • Anguilla japonica (Japanese eel, unagi) — the primary species used in Japanese cuisine
  • Anguilla anguilla (European eel) — historically consumed in Europe, now critically endangered
  • Anguilla rostrata (American eel) — found in North American waters, used in some regional cuisines
  • Anguilla australis (shortfin eel) — native to Australia and New Zealand
  • Anguilla dieffenbachii (longfin eel) — native to New Zealand, culturally significant to Māori

Culinary uses

Freshwater eel is most famously prepared as kabayaki: the eel is butterflied, skewered, steamed (in Kanto style), then grilled while being repeatedly brushed with a sweet soy-based tare sauce. The result is a glossy, lacquered fillet with caramelized edges. Kabayaki unagi is served over rice as unadon (in a bowl) or unaju (in a stacked lacquered box), often with a sprinkle of sansho pepper [2]. It also appears as a nigiri topping, where the warm grilled eel is brushed with tare and placed over vinegared rice, sometimes wrapped with a strip of nori [1]. In other cuisines, freshwater eel is smoked, stewed, or fried. European preparations include jellied eels (London) and eel soup (Dutch palingsoep). The flesh is rich and fatty, pairing well with sweet glazes, citrus, and peppery accents like sansho or black pepper.

Cross-cuisine context

Freshwater eel has no direct analogue in Mexican cuisine. The closest textural and flavor parallel might be the rich, fatty flesh of huachinango (red snapper) or mojarra when grilled whole, but neither shares the catadromous lifecycle or the specific lacquered preparation of kabayaki. In other LA-relevant cuisines, freshwater eel appears in Japanese dishes (unagi nigiri, unadon) and occasionally in Chinese and Korean preparations, where it is grilled or braised with soy-based sauces. The Korean dish jangeo-gui (grilled eel) uses a similar sweet-savory glaze and is often eaten with ssam (lettuce wraps). No direct analogue exists in Salvadoran, Guatemalan, or other Central American cuisines represented on the platform.

Notes for cooks

  • Freshwater eel is almost always sold pre-cooked and frozen as kabayaki in Japanese markets. Thaw and reheat under a broiler or in a dry pan to restore the lacquered surface.
  • The fat content is high, so the eel does not dry out easily during reheating. Avoid overcooking, which can make the flesh tough.
  • Sansho pepper (Japanese prickly ash) is the traditional finishing spice. It cuts the richness and adds a citrusy, numbing note.