Negi: Japan's Essential Green Onion and How It's Used

Negi (ネギ / 葱) appears in an enormous proportion of Japanese dishes — in ramen, in yakitori, in miso soup, in yakisoba, in mentsuyu dipping sauces, on sashimi, in gyoza filling. It is the background aromatic of Japanese cooking, the thing you often barely notice but would immediately miss.

Understanding negi means understanding two different vegetables that share the same name in Japanese and serve different functions:

Two Types of Negi

Naga-Negi (長ネギ) — Long Welsh Onion

Naga-negi (長ネギ, literally "long onion") is the Japanese variety of Welsh onion (Allium fistulosum) — a tall, thick-stalked onion with a long white section (the shirobara or white part) and green tops. It looks more like a leek than what English speakers think of as a green onion.

Characteristics:

Length: 40-60cm
Diameter: 1.5-2.5cm at the white part
White section: long, thick, mild when raw, sweet and soft when cooked
Green tops: darker, more pungent, often used as garnish

Naga-negi is distinctly different from Western leeks — milder, less fibrous, and with a thinner stalk — but they occupy a similar culinary position.

Where it's used:

Yakitori: Negi-ma (ねぎま) is one of the most classic yakitori skewers — alternating pieces of chicken with naga-negi white section, charcoal-grilled. The negi caramelizes and sweetens on the grill.
Nabe (hotpot): Naga-negi white sections are a standard hotpot component — they become very soft and sweet with extended cooking.
Miso soup: Thin rounds of naga-negi added to miso soup at the end of cooking.
Stir-fry: Diagonal-cut naga-negi, added early in stir-fry cooking to build the aromatic base.
Ramen topping: Both raw (sharp, clean) and charred (sweet, smoky) naga-negi appear as ramen toppings.

Regional varieties:

Kantō-style negi (Tokyo region): Long white section, thick; the standard naga-negi for most Japanese cooking.
Kansai-style negi (Osaka/Kyoto): Thinner, with a proportionally longer green section; sometimes called Kyoto negi.
Kuronegi (黒ネギ): A specialty slow-roasted negi preparation — nagi-negi roasted whole until charred black on the outside, then the sweet, deeply caramelized white interior scooped out. A specialty of some yakitori restaurants.

Ha-Negi (葉ネギ) / Kizami-Negi — Thin Green Onion

Ha-negi (葉ネギ, "leaf onion") — also called ao-negi (青ネギ, "green onion") or hoso-negi (細ネギ, "thin onion") — is the variety that more closely resembles what Western cooks call green onion or scallion. Much thinner, entirely green, with almost no thick white section.

Characteristics:

Much thinner than naga-negi (approximately 5-8mm diameter)
Predominantly green
Used almost exclusively fresh, as a garnish or flavoring
More pungent and assertive flavor than naga-negi white section
Finely sliced into kizami-negi (刻みネギ, chopped/minced green onion)

Where it's used:

Ramen: Chopped ha-negi (or thinly sliced naga-negi green tops) is almost universal as a ramen topping
Udon and soba: A handful of chopped green onion as a standard condiment
Miso soup: Added at the end, raw, for freshness and color
Tofu dishes: Chopped green onion with grated ginger and soy sauce is the classic hiyayakko (cold tofu) topping
Grilled fish: Scattered over shioyaki or other grilled protein as a garnish
Takoyaki and okonomiyaki: Chopped green onion scattered over the top

The White vs. Green Division

In Japanese cooking, the white and green parts of negi are not interchangeable — they serve different functions:

White part (shiro section):

Milder, sweeter
Appropriate for cooking (softens and sweetens with heat)
Can be eaten raw in larger pieces
Used in yakitori, nabe, stir-fry

Green part (ao section / midori section):

More assertive, pungent flavor
Primarily used as a garnish, added after cooking or just before serving
Finely chopped (kizami-negi)
Provides color and fresh flavor contrast to cooked dishes
Also used in ramen broth for aromatics during cooking (then strained out)

This division is so internalized in Japanese cooking that most recipes specify "white part" or "green part" separately, and most Japanese home cooks unconsciously allocate accordingly.

Cutting Techniques

Kizami-negi (刻みネギ) — minced green onion: The most common cut. Slice thin green onion (or green tops of naga-negi) into thin rings, 1-2mm. Used as a condiment and garnish for almost any Japanese dish.

Naname-giri (斜め切り) — diagonal cut: Cut naga-negi at a 45° angle into 3-5cm pieces. Increases surface area for cooking; the standard cut for nabe, stir-fry, and yakitori.

Shiro-negi (白ネギ) rings: Thin cross-sections of naga-negi white part, 3-5mm thick. Used as miso soup additions, as rings on grilled chicken, or as raw condiment.

Shiraga-negi (白髪ネギ) — white hair negi: Very fine julienne of the white part — cut into 5cm sections, then cut into hair-thin strips. Soaked in ice water to remove sharpness and curl slightly. Used as a refined garnish on sashimi, yakitori, and grilled fish. Requires patience.

Negi in Japanese Cuisine by Category

Ramen: Both naga-negi (white section, braised or charred) and ha-negi (thin sliced, raw) are standard ramen toppings, varying by style — shoyu ramen typically uses naga-negi, while tonkotsu ramen uses thin green onion.

Yakitori: Negi-ma (chicken + white naga-negi) is the archetypal yakitori combination. The negi caramelizes from the charcoal heat, becoming sweet.

Nabe: Naga-negi is a near-universal nabe ingredient — the long white pieces cook slowly in broth, absorbing the surrounding flavors.

Soba and udon: Chopped green onion (yakumi, 薬味) is placed beside soba and udon as a self-added condiment — diners add their preferred amount to the broth or dipping sauce.

Okonomiyaki and yakisoba: Chopped green onion scattererd over the top is one of the four standard toppings (with bonito flakes, aonori, and mayonnaise).

Miso soup: Negi (thin sliced) is the most common miso soup ingredient after tofu and wakame.

Outside Japan

In Western countries, scallions or green onions are the closest substitute for ha-negi. For naga-negi white parts in cooked applications, leeks work reasonably well but cook more slowly and have a more fibrous texture.

Japanese grocery stores (Nijiya, Mitsuwa, etc.) sell naga-negi; regular Asian grocery stores often carry it as "Japanese long onion" or "Welsh onion."

Growing

Naga-negi is one of the easiest vegetables to grow in temperate climates — it tolerates cold, requires minimal care, and produces throughout most of the year. It's a popular garden plant in Japan where many households grow a small patch for constant fresh availability.

Negi's ubiquity in Japanese cooking is evidence of something the cuisine understands deeply: the best aromatics are the ones that work so well you stop noticing them until they're absent. Negi is in the background of Japanese cooking in the way that onion and garlic are in French cooking — structural rather than starring, defining rather than decorating.

The full recipes live in the book.

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