Grains & Rice

Somen Noodles

Very thin white wheat noodles eaten cold with dipping broth in Japanese and Korean summer dishes.

Somen are extremely thin Japanese wheat noodles, traditionally stretched with a little oil and dried. They are usually served chilled over ice with a light dipping sauce in summer, and the Korean equivalent, somyeon, appears in soups and banquet dishes. They cook in barely a minute and have a smooth, delicate texture.

Somen are the thinnest of all Japanese wheat noodles, with a diameter of roughly 1.0–1.3 mm—about the width of a bamboo skewer. They are made from wheat flour, salt, and water, extruded or hand-stretched into long, delicate strands that cook in a mere 1–2 minutes. This extreme thinness is the key to their character: when cooked correctly and immediately shocked in ice water, somen develops a smooth, silky surface that feels clean on the palate and carries dipping sauces beautifully. Their neutral wheat flavor makes them a perfect vehicle for bold or nuanced accompaniments.

The noodle's history traces to the Heian period (8th–12th century), when Chinese wheat-noodle techniques were adapted in Japan. The name derives from Chinese characters meaning "fine thread." While somen are now enjoyed year-round, they remain deeply associated with summer in Japan—particularly the tradition of Nagashi Somen, where noodles flow down a fluted bamboo chute over ice and are caught in individual bowls, combining eating with a playful seasonal activity. Nandan Somen from Hyōgo Prefecture carries a Japan Premium designation, reflecting the region's centuries-old mastery of the craft.

The primary failure with somen is overcooking: even 30 seconds past al dente produces gumminess. The noodle's quality also depends on proper rinsing to remove surface starch and shocking in ice water to set that characteristic silky texture. Hand-pulled somen achieves an even more delicate quality than machine-made versions, but both require the same precise timing and immediate service.

Measured in: g
Storage: Pantry

Allergens

Gluten

Types & varieties

Nandan Somen

The most renowned somen, produced in the Nandan region of Hyōgo Prefecture; carries Japan Premium designation and protected regional status.

Inaniwa Somen

From Akita Prefecture; slightly thicker and has a firmer bite; designated as a national heritage grain product.

Shimizu Somen

From Shizuoka Prefecture; known for a smooth, silky texture that carries sauces well.

Hand-Pulled Somen

Traditional artisan method; produces silkier, more delicate strands; a specialty item with superior mouthfeel.

Machine-Made Somen

Standard commercial variety; widely available and consistent in quality; perfectly adequate for everyday use.

Colored Somen

Green (matcha), pink (ume plum), or gold (egg yolk) varieties; used for festive or celebratory dishes and visual appeal.

The Nagashi Somen Tradition

Nagashi Somen—where noodles flow down a slanted bamboo or plastic chute over ice—is both a culinary tradition and a summer social ritual in Japan. The flowing noodles are caught in individual bowls of cold dipping sauce, creating an interactive dining experience that is especially popular at festivals and outdoor gatherings in Nagano's Shinshu area. The flowing motion keeps the noodles ice-cold and prevents them from sticking. For home preparation without a chute, serve somen in a wide bowl surrounded by ice and use chopsticks to lift individual portions into dipping sauce.

Use 2–3× concentrated men-tsuyu diluted with cold dashi or water
Keep the sauce vessel surrounded by ice throughout service
Noodles will begin to stick within minutes of plating; work quickly

Common uses

Cold dish with dipping broth (the most common preparation); tsuyu, mitarashi, or nitsuke sauceNagashi somen: noodles flow down a fluted bamboo chute over ice, caught in individual bowlsIn clear broth soup (suimono) served hot in cooler monthsWith hiyashi shiso or negi topping and shichimi togarashi for a simple summer lunchAs a textural element in sushi rolls (chūkamen somen)Served in hot broth as hiyashi shōmen during cooler months

Tips & pitfalls

Bring a large pot of water to a rolling boil; use at least 2 liters per 100g of dried noodles to prevent crowding and sticking
Add noodles gradually, stirring gently once at the start—do not walk away during cooking
Taste test at exactly 1 minute; noodles should be barely tender with a slight white core still visible
Drain immediately and rinse under cold running water for 1–2 minutes to remove surface starch thoroughly
Shock in ice water after rinsing to set the silky texture; drain very thoroughly before serving
For dipping sauce, dilute standard men-tsuyu 2–3× with cold water or dashi; adjust to taste
Do not add oil to cooking water—it prevents proper starch removal during rinsing and creates a slick surface that sauce cannot adhere to
Serve immediately after plating; noodles become gummy within 10 minutes even at room temperature
Store dried somen in an airtight container in a cool, dry place; avoid refrigeration which introduces humidity

Nutrition

356kcal

Energy

1490 kJ · per 100 g

Where the calories come from

Protein 13%Carbs 85%Fat 2%

Protein

11.4g

23% DV

Carbs

74.1g

27% DV

Fat

0.8g

1% DV

Fiber

4.3g

15% DV

Sodium

1840mg

80% DV

Notable micronutrients

Selenium15% DV

Thiamin (B1)8% DV

Iron7% DV

Magnesium7% DV

Phosphorus6% DV

Niacin (B3)5% DV

Source · USDA FoodData Central · Noodles, japanese, somen, dry

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Good to know

Type: Dried wheat noodle (Japanese)
Origin: Japan, with records from the Heian period (8th–12th century)
Primary Production Region: Hyōgo Prefecture (Nandan area), also Nagano and Miyazaki Prefectures
Diameter: Approximately 1.0–1.3 mm (the thinnest Japanese noodle variety)
Main Ingredients: Wheat flour, salt, water; some varieties include vegetable juice for colored noodles
Cooking Time: 1–2 minutes (taste at 1 minute; do not walk away from the pot)
Shelf Life (dried): 1–2 years in cool, dry storage
Shelf Life (cooked): Use immediately; does not hold well
Yield: Doubles to triples in volume when cooked
Serving Temperature: Ice-cold (standard), room temperature, or in hot broth
Traditional Season: Summer in Japan (associated with Natsu no Nanakusa)
Difficulty: Easy to prepare; the skill is timing the cook correctly

Substitutes

Korean Somyeon — The Korean somen equivalent; virtually identical in diameter and behavior; freely interchangeable in recipes.
Rice Vermicelli (Bánh Đa Giò) — Similar diameter and delicate texture; rinse well after cooking; has less wheat flavor and softer mouthfeel.
Very Thin Spaghetti (Capellini) — Break to approximate length; cook to al dente; rinse and shock the same way; slightly more resilient texture.
Wonton Wrappers (cut into strips) — Emergency substitute only; cut into 2–3mm strips; cook 30 seconds; texture is noticeably softer.

Pairs with

Men-tsuyu (dipping sauce concentrate)Mitarashi SauceShiso Leaves (shredded)Negitoro (minced green onion)Bonito Flakes (katsuobushi)Grated DaikonSesame OilUmeboshi PasteEgg Yolk (raw)

Also called

Somyeon · 소면 · Thin Wheat Noodle