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Sake Production Steps

• Overview of sake production steps focused on linearity.

  • Last week covered the first five steps in detail.

Harvesting and Rice Preparation

• Sake production begins with the harvest of sake rice, distinct from regular food rice.

  • Sake rice has specific strains suited for fermentation.

• Important distinction made between sake rice and rice typically consumed as food.

• Polishing Process:

  • Involves removing outer layers of rice (bran).

  • Different levels of polishing impact the final product and hydration process.

Hydration of Rice

• Hydration Steps:

  • Divided into "wash" and "soap," in essence the same actions differing in time spent in water.

  • Polishing level affects hydration duration:

    • Less polished rice: immersed for a couple of hours.

    • More polished rice: typically soaked for about 20 minutes, accurately timed with a stopwatch.

Steaming Process

• Steaming the Rice:

  • Kills any harmful organisms, ensuring a sterile environment for subsequent processes.

  • Cleanses the rice to start with a "clean slate."

Koji Making Process

• Mold (Aspergillus oryzae) is sprinkled on steamed rice.

  • Traditionally selected for its utility in fermentation.

  • Historical Context:

    • Use of molds in Asian fermentation processes is a long-standing practice.

• Research:

  • Recent studies on environmental strains of Aspergillus oryzae.

    • Characterization of strains can highlight risks of mycotoxins (e.g., aflatoxin).

    • Out of 36 analyzed strains, one-third exhibited mycotoxin genes, other two-thirds did not.

    • Importance of careful selection to avoid harmful strains.

• The conversion of rice components into sugars and amino acids occurs over a two-day process under aerobic conditions.

Multiple Parallel Fermentation

• Distinct from wine (fruit-based), sake starts with grains, similar to beer.

• Mashing:

  • Decomposition of starches into sugars during the koji-making process.

  • At this stage, the yeast is pitched into the sugary substrate.

• Key Distinction from Beer Fermentation:

  • In beer brewing, wort is boiled, deactivating enzymes. In sake, enzymes remain active.

  • Continuously promotes mashing and fermentation concurrently.

Fermentation in Moromi

• Koji rice with active molds and enzymes is mixed with steamed rice in fermentation.

  • New rice is added for continual breakdown of starches alongside yeast fermentation action.

  • Parallel Fermentation:

    • Continuous breakdown of starches occurs, leading to fermentation lasting two to six weeks.

    • This duality accelerates production of ethanol and CO2 alongside breaking down starches.

Separation and Filtration

• Post fermentation, the separation of solids from the liquid takes place.

  • Traditional Methods:

    • Use of cloth bags to strain liquid, retaining solids.

  • Modern techniques involve more sophisticated filtration systems.

    • Results in clarity of sake—important for product quality.

Pasteurization and Maturation

• Following clarification, sake is pasteurized and then matured.

  • Maturation generally occurs in stainless steel tanks for six to twelve months.

  • Dilution Rates:

    • Commonly misrepresented; genuine sake may not reach 20% ABV naturally.

    • More typically, ABV ranges close to 18% without fermentation affecting it beyond natural processes.

    • Many commercial varieties might be diluted to 11% prior to bottling.

Vinegar Production Process

Alcohol Fermentation and Vinegar Making

• Understanding vinegar involves first the alcohol fermentation process, followed by oxidation.

  • Vinegar, specifically acetic acid, is primarily produced by converting ethanol into acetic acid.

• Acetic Acid Bacteria:

  • Main Agent: Acetobacteraceae used for the oxidation of ethanol.

  • Discovered by Louis Pasteur in the 1860s during his research on winemaking spoilage.

Historical Context of Vinegar Production

• The New Orleans Process:

  • Linked to historical shipping practices from France to New Orleans.

  • Wine transport often led to vinegar formation due to compromised barrels allowing for oxidation.

  • Commercial producers aerate wines deliberately for vinegar production, using similar strategies.

  • Many modern processes implement vinegar generators for efficiency.

Technical Details of Vinegar Generators

• Functionality includes:

  • Dripping alcohol solution through layers of wood shavings inoculated with Acetobacter.

  • Aerated conditions to favor the conversion process.

  • Circulation systems enhance contact time for complete conversion.

Balsamic Vinegar Production

Traditional Balsamic Vinegar

• Geographically protected production norms dictate that authentic balsamic vinegar can only be produced in Modena, Italy using Trebbiano grapes.

• Production Process:

  • Grapes are cooked down into a must which caramelizes, employing Mallard reactions for flavor.

  • Barrel Aging:

    • Involves transferring to multiple oak barrels over a twelve-year fermentation period.

    • Each year, the product is transferred to new barrels of differing wood types to impart varying flavors.

    • Final product retains lower acidity compared to standard vinegar.

• Evaporation Factor:

  • Barrels lose volume due to evaporation each year, contributing to the final concentrated viscosity of the balsamic vinegar.

  • Authentic balsamic is often syrupy and used as a flavor enhancer, unlike commercial versions that typically exhibit greater acidity.

Final Notes on Vinegar Variants

• Other types of vinegar produced from diverse sources (e.g., cane sugar, apples, barley, rice) indicate versatile production capacities across various substrates for acetic acid creation.

• Overall balance of flavor in vinegars affected by choice of base material and fermentation conditions.