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Ingredient

Kombu for dashi

Kombu is an edible brown seaweed central to many dashi styles. Species, region, thickness, maturation, cleaning, water quality and extraction conditions affect the result, so glutamate, moisture or price values must be tied to a defined product, lot or experiment.

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Ingredient

Katsuobushi

Katsuobushi is a cooked, smoked and dried bonito product that may undergo additional mold and drying cycles. Processing grade, production region, block or shaving format and shaving time influence aroma and dashi extraction.

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Ingredient

Kioke-fermented shoyu

Kioke shoyu is soy sauce whose fermentation or maturation includes a traditional wooden barrel. The word kioke alone does not prove age, pH, salinity, origin or grade, so each detail must be checked on the product label and lot documents.

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Ingredient

Kome koji

Kome koji is steamed rice cultivated with Aspergillus oryzae under controlled conditions. It is used in products including miso, sake and mirin. It must not be conflated with shoyu koji, which typically uses a soybean and wheat substrate and must be treated separately. Culture strain, temperature, humidity and substrate must be documented.

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Ingredient

Chouhaku-kin powdered koji starter

Chouhaku-kin is a powdered white-spore tane-koji starter intended by the maker listing for cultivating koji for shio-koji and miso. The 20 g sachet is specified for a stated substrate quantity, requires refrigeration and must be used according to maker directions. It is a concentrated process input, not ready-to-eat koji.

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Ingredient

Koshihikari rice

Koshihikari is a japonica rice cultivar of commercial and research importance. The cultivar name does not prove region, harvest year, cultivation method, milling, age, amylose or cooking quality; each value must attach to the specific product and lot.

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Ingredient

Fresh wasabi rhizome

Fresh wasabi is identified by species, cultivar, origin and lot. Grating ruptures cells and brings glucosinolates together with myrosinase to form volatile isothiocyanates; intensity and composition vary with genetics, plant part, season and environment.

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Ingredient

Dutch-grown fresh wasabi, 50 to 60 g

A fresh wasabi rhizome grown in a Dutch greenhouse and sold as one 50 to 60 g piece. The grower page describes 18 to 24 months in its Netherlands greenhouses and hand harvesting. Dutch origin, piece weight and refrigeration remain product-level facts and are not presented as Japanese wasabi.

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Ingredient

Kito yuzu

Kito yuzu is a protected geographical indication for certified product from Kito in Tokushima. Peel, juice and peel oil are different product forms; the aroma profile includes compounds such as limonene, gamma-terpinene, linalool and Yuzunone, but their proportions depend on fruit and process.

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Ingredient

Hon mirin

Hon mirin is a sweet alcoholic seasoning made from glutinous rice, koji and alcohol through saccharification and maturation. The process should not be described as generic alcoholic fermentation. Sugar and ABV must come from the product label or the lot certificate of analysis.

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Guide

Glutamate and IMP umami synergy

This science guide connects glutamate, IMP and the T1R1/T1R3 receptor. It separates a research-supported mechanism, perceived taste and content measured in a product or lot.

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Molecule

L-glutamate

L-glutamate is the ionic form of glutamic acid and participates in umami perception. In the presence of nucleotides such as IMP, the taste response can become stronger. Actual amounts vary among ingredients and products, so flavor intensity or a fixed concentration should not be inferred without measurement.

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Molecule

Inosine monophosphate, IMP

IMP is a taste-active nucleotide. In the presence of glutamate it can strengthen the response of the T1R1/T1R3 receptor. This does not establish a fixed amount in katsuobushi, fish or nori: actual concentration depends on the ingredient and measurement.

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Guide

AITC and wasabi pungency

The guide explains how rhizome grating and the enzyme system relate to volatile isothiocyanates, particularly AITC. It does not turn pungency into a health promise or food-safety control.

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Molecule

Allyl isothiocyanate, AITC

AITC is a volatile compound contributing to characteristic pungency after wasabi tissue is disrupted. Concentrations vary, so the explanation focuses on the mechanism rather than assigning one generic number to every product.

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Preparation

Ichiban dashi

Ichiban dashi is a first stock commonly based on kombu and katsuobushi. Learn what each ingredient contributes, how time and temperature change extraction, and why glutamate and IMP strengthen umami together. The exact ratio depends on the ingredients and the result you want.

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Technique

Controlled dashi extraction

Dashi extraction begins with deliberate choices about kombu, water, time, temperature and filtration. Changing any one of them can affect clarity, aroma and flavor. This section explains which variables are worth comparing without turning one experiment into a universal recipe.

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Equipment

Wasabi grater

A wasabi grater produces a fine paste from a fresh rhizome. Compare tools by surface material, tooth density, size, rigidity, care and collection brush. A stainless-steel Hagane-zame tool is not sharkskin, so check the material of the model you choose.

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