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Japanese · IV The Method · Koji & Fermentation

Sakekasu Amazake and Kasujiru Lees Applications

‹ Koji & Fermentation

I

Origin

Japan — sake brewing regions: Nada (Kobe), Fushimi (Kyoto), Niigata, Akita; kasu utilisation documented from Edo period

II

Description

Sake kasu (sake lees) — the solid residue remaining after pressing fermented rice moromi to extract sake — is a deeply nutritious, complex ingredient with multiple culinary applications. Rich in living koji enzymes, amino acids, vitamin B complex, and residual alcohol (typically 8–14%), sake kasu adds depth, body, and sweetness to preparations ranging from fish marinades to winter soups. The three primary applications: kasujiru (kasu soup), a winter warming broth of sake kasu dissolved in dashi with root vegetables and salmon; kasuzuke (kasu-marinated fish), where fish is buried in kasu paste with salt and sugar for days to weeks; and amazake (sweet kasu drink), where kasu is dissolved in hot water with sugar for a nurturing traditional drink. Unlike shio koji, sake kasu adds more body, alcoholic depth, and sweetness.

III

The Thread

—Both sake kasu and wine marc represent the enzymatically active lees byproduct of fermented grain/fruit pressed for beverage production, used in secondary culinary and distillation applications European
—Both traditions use rice wine lees as flavour-enriching cooking ingredient, with fermented grain byproduct adding body, sweetness, and complexity to preparations Korean
IV

Flavour Context

Mellow alcoholic warmth, rich sweetness, complex fermented rice depth, enzymatic umami, caramelising sugars under heat

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