Kenchinjiru (Iwate Style)
Cuisine: Japanese
Region: 岩手県
Servings: 6人分
Kenchinjiru (Iwate Style), also known as Iwate vegetable tofu soup, is a hearty Japanese soup built on firm tofu fried in oil until crumbly, then stir-fried with daikon, carrot, burdock, konnyaku and mountain ferns before a long simmer in dashi and pale usukuchi soy sauce.
At a glance
Time: about 50 min · Serves about 4 · Difficulty: medium · ≈ 280 kcal per bowl
Kenchinjiru (Iwate Style), also known as Iwate vegetable tofu soup, is a hearty Japanese soup built on firm tofu fried in oil until crumbly, then stir-fried with daikon, carrot, burdock, konnyaku and mountain ferns before a long simmer in dashi and pale usukuchi soy sauce. Unlike many regional versions, northern Iwate skips the meat and leans on toasted tofu aroma and sweet root vegetables. It was traditionally made ahead for Little New Year and reheated through the day; at home, store-bought boiled mountain greens make it weeknight-friendly if you keep the fry-then-simmer step.
Ingredients
- Daikon radish 150g
- Carrot 50g
- Burdock root (gobo) 50g
- Firm tofu 2 blocks (about 600g)
- Aburaage (fried tofu pouches) 2 sheets (about 20g)
- Block konnyaku 50g
- Zenmai fern (boiled or rehydrated) 100g
- Warabi fern (boiled or desalinated) 80g
- Shiitake (or shimeji) 50g
- Negi (Japanese leek) 20g
- Neutral oil (or sesame oil) 3–4 Tbsp
- Dashi (kombu, niboshi, katsuobushi, etc.) 1.1 L
- Usukuchi soy sauce 5–7 Tbsp
- Sake 2 Tbsp
- Mirin 2 Tbsp
- Salt a pinch
Steps
- Lightly press the firm tofu with paper towels to remove moisture, then roughly crumble it by hand. Peel the daikon and carrot and cut into 2–3 mm thick gingko-leaf slices; briefly boil the daikon and drain. Shave the burdock into thin strips and soak in water to remove astringency.
- Cut the konnyaku into 1 cm cubes and briefly boil to remove the sliminess. Pour hot water over the aburaage to degrease, then cut into 1 cm squares. Cut the zenmai and warabi into bite-size lengths (5 mm–1 cm) and thinly slice the shiitake. Thinly slice the negi into rings.
- Heat the oil in a heavy pot and add the crumbled tofu. Stir-fry over medium heat for 5–10 minutes until the tofu is crumbly, lightly browned on the bottom of the pot, and most of the moisture has cooked off (the key to Iwate-style kenchinjiru).
- Add the daikon, carrot, burdock, konnyaku, aburaage, mountain vegetables, and mushrooms and continue stir-frying so the oil and fragrant tofu coat the vegetables.
- Pour in the dashi and bring to a boil. Add 5 Tbsp usukuchi soy sauce, the sake, mirin, and a pinch of salt. Simmer over medium heat for 20–30 minutes until the vegetables are tender and the flavors meld; adjust with the remaining soy sauce and scatter the negi on top.
- Ladle into bowls. It is delicious right away or reheated the next day. For a ozoni-like touch, add grilled mochi if you like.
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Notes
Iwate kenchinjiru skips meat and instead thoroughly fries the tofu in oil until crumbly—that is its defining trait. Firmer cotton tofu holds its shape better and is easier to fry.
Properly rehydrating dried zenmai or salt-cured warabi takes days. For home cooking, use store-bought boiled packs or pre-prepped mountain vegetables. If you cannot find them, boiled fuki, boiled bamboo shoots, or nameko mushrooms still keep a rustic feel.
Some households in the Kesen area use camellia oil. Adding a little sesame or camellia oil to the neutral oil deepens the aroma.
Usukuchi soy sauce keeps the color pale; if you only have regular soy sauce, use a little less.
Reheating the next day lets the flavors soak in even more. This is a soup traditionally made ahead for Little New Year and similar occasions.
Time and temperature
Fry tofu: medium heat 5–10 min until crumbly and lightly browned · Stir-fry vegetables: 2–3 min more · Simmer: medium heat 20–30 min until tender
Nutrition
280 kcal · Protein 18 g · Fat 14 g · Carbs 22 g
1 bowl (about 400 ml broth plus toppings), estimate
Substitutes
- Zenmai/warabi → boiled fuki, bamboo shoots, or nameko mushrooms
- Usukuchi soy sauce → regular soy sauce (use a little less)
- Neutral oil → add a splash of sesame or camellia oil
- Shiitake → shimeji or enoki
- Firm tofu → cotton tofu on the firm side (avoid silken)
Storage
Cool, then refrigerate in a sealed container up to 2 days; flavor deepens overnight. Reheat gently until simmering, topping up with a little dashi or usukuchi soy if needed. Freezing is not ideal—konnyaku and tofu turn spongy.
FAQ
- How is Iwate kenchinjiru different from other versions?
- Northern Iwate typically omits meat and fries the tofu until crumbly so the soup rests on tofu aroma and root vegetables; many other regions add pork or other meat.
- Why fry the tofu first?
- Cooking off moisture until the tofu is crumbly and lightly browned builds the toasted flavor that defines Iwate-style kenchinjiru; boiling alone skips that layer.
- What if I cannot find mountain ferns?
- Use boiled fuki, bamboo shoots, nameko, or everyday mushrooms. Dried zenmai takes days to rehydrate—store packs are fine for home cooking.
- Can I make it ahead?
- Yes. It tastes even better reheated the next day, which matches the Little New Year habit of cooking a big pot and warming it as needed.
Origin and history
Kenchinjiru is a hearty soup of root vegetables, konnyaku, mountain greens, and tofu that are first fried in oil, then simmered in dashi and seasoned with soy sauce. It is known across Japan from Kanagawa onward, but in Iwate (especially the north) the hallmark is no meat and tofu fried until crumbly.
It was once said to be made in large batches for year-end cleaning and New Year, especially Little New Year (women’s New Year), then reheated so the women of the house could rest. Firmer tofu, local mountain vegetables, and camellia oil in the Kesen area all show local craft.
At home you can recreate it easily with boiled mountain vegetables and mushrooms from the store. Do not skip the fry-then-simmer step: transfer the toasted tofu aroma and vegetable sweetness into the dashi for a true Iwate-style bowl.