# Koji & fermented flavor-starter kits (consumer) Aspergillus oryzae solid-state fermentation of steamed grain into koji, shio-koji, miso and amazake bases — sold as finished consumer flavor starters by Clearspring (UK organic miso), Omsom (Asian flavor starter kits, DayDayCook-acquired), Toiro (premium Japanese miso import), Umami Cartel (shio-koji) and South River Miso (craft handmade American miso since 1982). Source: https://en.bioecon.ru/technology/koji-fermented-flavor-starters-consumer/ Updated: 2026-08-18 ## Overview and value chain Markers: [EC: EU Reg (EC) 1924/2006 nutrition claims & FDA FSMA fermented-foods guidance | OECD: Food systems | Regulator: FDA (USA), EFSA (EU)] Koji is the solid-state fermentation of steamed rice, barley or soybean by the filamentous fungus *Aspergillus oryzae*, producing the enzyme-active base for miso, shio-koji, amazake, tamari, sake and mirin. The consumer flavor-starter category packages koji-derived bases as finished retail products — bottled shio-koji seasoning, jarred miso paste, amazake drink bases and assembled flavor-starter kits — bringing Japanese fermentation technique to Western retail aisles. This article covers the consumer finished-product slice; contract fermentation bases sold B2B to food brands belong to `fermented-food-ingredients-b2b`, and live-culture lacto-fermented vegetables (kraut, kimchi) belong to `traditional-fermentation`. Hanamaruki's 2026 rebranded liquid shio-koji global launch and DayDayCook's acquisition of Omsom frame the category's 2026 commercial momentum. The key directions of koji consumer flavor starters are: 1. **Shio-koji liquid seasoning (Shio-Koji Liquid Seasoning):** Umami Cartel's shio-koji sauce and Hanamaruki's 2026 rebranded global liquid shio-koji — the ready-to-use koji-salt marinade that became the category's breakout consumer format. 2. **Premium Japanese miso import (Premium Japanese Miso Import):** Toiro's curated single-origin Japanese miso and Clearspring's organic Japanese miso range — the premium white/barley miso pastes carrying koji fermentation into European and US retail. 3. **Craft handmade American miso (Craft Handmade American Miso):** South River Miso Company (Conway, Massachusetts; founded 1982), producing traditional wooden-vat handmade koji miso for the US craft market. 4. **Asian flavor starter kits (Asian Flavor Starter Kits):** Omsom's sauce-and-seasoning starter kits for regional Asian cuisines (acquired by DayDayCook), extending koji-based umami into multi-cuisine home cooking. ### Sectoral value chain ``` [steamed rice / barley / soybean] ──> [Aspergillus oryzae inoculation] ──> [koji solid-state fermentation] │ (enzyme-active koji) │ ▼ [retail consumer pack] <─── [formulation into miso / shio-koji / amazake] <─── [harvest + blend] ``` ### Value chain levels | Level | Description | Key inputs/outputs | |:---|:---|:---| | **Grain Preparation** | washing, soaking and steaming rice, barley or soybean to gelatinise starches for fungal access | **In:** whole grain, water. **Out:** steamed substrate. | | **Koji Inoculation** | inoculation with *Aspergillus oryzae* spore culture (tane-koji), typically from a starter supplier | **In:** steamed grain, tane-koji. **Out:** inoculated substrate. | | **Solid-State Fermentation** | 40–50 hour incubation in wooden or tray bioreactors at 30–35 C with controlled humidity and aeration | **In:** inoculated substrate. **Out:** enzyme-active koji (amylase, protease). | | **Harvest & Formulation** | blending finished koji into miso (with salt and soybean), shio-koji (with salt and water) or amazake (with water) | **In:** koji, salt, soybean, water. **Out:** miso / shio-koji / amazake base. | | **Maturation & Packaging** | ageing miso in wooden vats (weeks to years), then bottling shio-koji or jarring miso for retail | **In:** formulated base, packaging. **Out:** retail consumer pack. | | **Retail Distribution** | distribution through specialty, natural-food and mainstream retail plus direct-to-consumer e-commerce | **In:** retail packs, cold chain. **Out:** consumer koji product purchases. | Cross-cutting technologies of the sector: - **Tane-koji starter culture (Tane-Koji Starter):** the *Aspergillus oryzae* spore inoculum supplied by specialist starter houses (e.g. startercultures.eu), the upstream input all koji production depends on. - **Wooden-vat fermentation (Wooden-Vat Fermentation):** traditional cedar or cypress vats (South River Miso, Japanese craft producers) that host the microbial ecology shaping koji flavor, distinct from stainless-steel tray bioreactors. - **Cold-chain shio-koji bottling (Shio-Koji Bottling):** pasteurisation-free or lightly pasteurised bottling that preserves koji's live enzyme activity for retail shelves. --- ## US The US anchors the consumer koji category through craft miso production (South River Miso), Asian flavor-starter kits (Omsom), premium Japanese miso import (Toiro) and shio-koji seasoning (Umami Cartel), under FDA's fermented-foods and FSMA framework. ### South River Miso, Omsom, Toiro, Umami Cartel - **South River Miso Company (Conway, Massachusetts; founded 1982):** the long-standing US craft producer of traditional handmade koji miso, aged in wooden vats — the reference American producer for the artisanal miso slice. - **Omsom (founded 2020):** Asian sauce-and-seasoning starter kits for regional cuisines; acquired by DayDayCook, extending koji-based umami into multi-cuisine home cooking and bundling with recipe platforms. - **Toiro (founded 2018):** curated single-origin Japanese miso (Saikyo Miso Takumi, Shojin Shirodashi) for the US premium market — the import-led premium miso channel. - **Umami Cartel (founded 2019):** bottled shio-koji sauce for the US umami-seasoning retail segment, riding Hanamaruki's 2026 global liquid shio-koji momentum. --- ## CN China is the historical origin of koji (麴, *qu*) for baijiu, soy sauce and fermented bean paste production, but the consumer flavor-starter-kit category as defined here has no confirmed Chinese commercial originator in 2026 sourcing. Chinese *qu* is an industrial fermentation-starter input for baijiu distilleries and soy-sauce fermenters rather than a finished retail consumer product, so the Chinese koji heritage sits upstream of this article's consumer-packaged slice. ### industrial qu heritage, no consumer starter SKU - **Industrial qu incumbent landscape:** Chinese baijiang and soy-sauce producers use solid-state *qu* starters as an industrial input, distinct from the finished consumer flavor-starter kit format covered here. - **No confirmed consumer SKU:** no Chinese commercial originator of a retail koji/shio-koji/miso consumer flavor-starter product cleared source confirmation in 2026 sourcing. - **Regulatory pathway:** a Chinese consumer fermented starter would clear GB 2712 / GB 2760 (food-additive) review plus MARA's fermented-foods framework, the same regime governing conventional fermented condiments. --- ## EU The EU anchors the organic-Japanese-miso retail segment through Clearspring, under the EU nutrition-claim framework and traditional-food and novel-food review pathways for fermented products. ### Clearspring organic miso, EU nutrition-claim framework - **Clearspring (London, United Kingdom; founded 1993):** the established EU organic-Japanese-foods brand, distributing organic white miso, barley miso and unpasteurised miso pastes across European natural-food retail — the premium koji miso channel for the EU market. - **EU nutrition-claim framework:** miso and shio-koji products carrying umami or probiotic-style claims fall under Reg (EC) 1924/2006; unpasteurised fermented products face additional hygiene and novel-food review where enzyme-active cultures are live. - **Starter culture supply:** European home-fermentation enthusiasts source *Aspergillus oryzae* tane-koji starter from specialist suppliers (e.g. startercultures.eu), underpinning the craft koji segment parallel to branded retail. --- ## Leading companies and research institutes | Company / Institute | Country | Key products / platforms | Tech features | Status 2026 | |:---|:---|:---|:---|:---| | **Clearspring** | 🇬🇧 United Kingdom | *Organic Japanese white & barley miso* | EU organic miso retail range; founded 1993 | commercial | | **Omsom** | 🇺🇸 USA | *Asian flavor starter kits* | Sauce-and-seasoning kits; DayDayCook-acquired; founded 2020 | commercial | | **Toiro** | 🇺🇸 USA | *Premium Japanese miso import* | Saikyo Miso Takumi, Shojin Shirodashi; founded 2018 | commercial | | **Umami Cartel** | 🇺🇸 USA | *Shio-koji sauce* | Bottled shio-koji umami seasoning; founded 2019 | commercial | | **South River Miso** | 🇺🇸 USA | *Craft handmade koji miso* | Wooden-vat traditional miso; founded 1982 | commercial | --- ## Tech stack and innovations The stack is built on solid-state fungal fermentation and craft maturation, rather than submerged-tank precision fermentation. 1. **Solid-state koji fermentation (Aspergillus oryzae Cultivation):** - The 40–50 hour solid-state incubation of *Aspergillus oryzae* on steamed rice or barley produces enzyme-active koji rich in amylases and proteases that convert starch and protein into the sugars and amino acids underlying miso's umami. - South River Miso's traditional wooden-vat process and Japanese craft producers maintain a richer microbial ecology than stainless-steel tray bioreactors, the source of craft miso's differentiated flavour. 2. **Shio-koji liquid formulation (Shio-Koji Bottling):** - Blending finished koji with salt and water, then fermenting into a pourable liquid seasoning, creates the shio-koji format whose 2026 Hanamaruki global relaunch and Umami Cartel retail bottling brought the category to Western consumers. - Lightly pasteurised or raw bottling preserves the enzyme activity that makes shio-koji a functional meat tenderiser and marinade, not just a salt substitute. 3. **Flavor-starter kit assembly (Omsom Kit Assembly):** - Omsom's assembly of koji-based sauces and seasonings into cuisine-specific kits (with recipe cards and portioned components) extends koji umami into multi-cuisine home cooking, the format acquired and scaled by DayDayCook. --- ## Value chains and production pipelines ### Industrial pipeline of a consumer koji flavor starter (FDA FSMA / EU Reg (EC) 1924/2006) ``` ┌───────────────────────────┐ ┌───────────────────────────┐ │ 1. Grain preparation │ ───> │ 2. Koji inoculation │ │ (steam) │ │ (Aspergillus oryzae) │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 4. Maturation & packaging │ <─── │ 3. Solid-state │ │ (vat ageing, bottling) │ │ fermentation │ └───────────────────────────┘ └───────────────────────────┘ │ ▼ ┌───────────────────────────┐ ┌───────────────────────────┐ │ 5. Formulation │ ───> │ 6. Retail distribution │ │ (miso/shio-koji/amazake)│ │ (specialty + e-com) │ └───────────────────────────┘ └───────────────────────────┘ ``` #### Stage 1: Grain preparation Whole rice, barley or soybean is washed, soaked and steamed to gelatinise the starches, producing the accessible substrate that *Aspergillus oryzae* can colonise — the input step shared by every koji-derived product from South River Miso's craft miso to Clearspring's organic range. #### Stage 2: Koji inoculation The steamed grain is cooled and inoculated with tane-koji (the *Aspergillus oryzae* spore starter from a specialist supplier), establishing the fungal culture that will perform the solid-state fermentation. #### Stage 3: Solid-state fermentation The inoculated substrate is incubated 40–50 hours in wooden vats or trays at 30–35 C with controlled humidity and aeration, during which the fungus secretes the amylases and proteases that convert grain starch and protein into the sugars and amino acids underlying miso's characteristic umami. #### Stage 4: Maturation & packaging The finished koji is blended with salt and soybean (for miso), salt and water (for shio-koji), or water (for amazake), then aged — miso in wooden vats for weeks to years at South River Miso — and finally jarred or bottled for retail. #### Stage 5: Formulation For assembled flavor-starter kits (Omsom), the koji-derived sauces and seasonings are combined with cuisine-specific recipe components into portioned consumer kits, extending koji umami into multi-cuisine home cooking. #### Stage 6: Retail distribution Finished consumer packs — bottled shio-koji (Umami Cartel), jarred miso (Clearspring, Toiro, South River Miso), or assembled kits (Omsom) — are distributed through specialty and natural-food retail plus direct-to-consumer e-commerce, the consumer endpoint of the koji flavor-starter category.