Pure Rice Vinegar is... During the cultivation period of Kyushu (including Shimane Prefecture), only organic-cultivated rice was used, and it was fermented over six months with Aya Town's famous water...

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Pure Rice Vinegar is...

rice vinegar
During the cultivation period of Kyushu (including Shimane Prefecture), only organic-cultivated rice was used, and it was fermented over six months with Aya Town's famous water (Designated by the Japan's Ministry of Environment's "Japan 100 Remarkable Waters").

It is pure rice vinegar made without any additives by traditional method.

The "Yamadai" Pure Rice Vinegar's Maker, Oyama Foods Ltd.

yamadai vinegar oyama foods
In the rich nature of Aya Town located in the central part of Miyazaki Prefecture, it is a long-established vinegar brewing manufacturer has been lasting for more than 80 years from the first time they made traditional fermented foods in fifth year of Showa period (AD 1930).

The Philosophy of Vinegar Manufacturing

In Miyazaki's affluent nature, "Aya's famous water" which is honed in the Japanese larch forest area is used for everything from brewing to sprinkling water and it's brewed by the traditional brewing method.

Fermentation over time done in outdoor using huge turtle pot is an unique brewing method that only has been done by Yamadai vinegar in nationwide.

Traditional Ancient Brewing Method

Yamadai vinegar is prepared by a process called "ancient brewing method".

It is a simple method of simply putting in 1/3 of the body of turtle pot in the ground, then put the good quality brown rice, good quality water, koji, and vinegar starter culture in it.

Bincho charcoal (white charcoal/bincho-tan) is put in, and the fermentation state is managed with a five-yen coin. Afterwards, with the method that can be taken as old as it is, we let the vinegar be made naturally with the sun of the southern country and the power of time.

In the turtle pots, koji starter culture, yeasts, and acetic acid bacteria are constantly active, and organic acids produced by them and amino acids in brown rice melt into raw rice vinegar.

traditional fermentation

Organic, Pesticide-free Rice

We are using only rice (white rice and brown rice) produced by organic farming, aiming to make vinegar that you can use safely.

organic rice

Remarkable Water

We are using "Aya Town's famous water" chosen by the Japan's Ministry of the Environment as one of the 100 most prestigious waters in Japan as the water for making all products.

"Aya Town's famous water" which is also used in Miyazaki's famous tofu store has mellow taste and it seems that you get a feeling of it's penetrating into your body immediately.

remarkable water

Traditionally-made Turtle Pots

The tutle pots used for making this rice vinegar are huge, one turtle pot capable of brewing 300-500 litres of raw rice vinegar. Because of the size, nowadays these pots are rarely be produced.

300 turtle pots are embedded in the southern side of the Aya factory on the hill which has good sunlight.

traditional turtle pots

Health Benefits of Rice Vinegar

rice vinegar health benefits
It is said that white rice contains only a small amount of vitamin B complex and not so high nutritional value.

However, fermenting white rice and processing it into vinegar produces 15 kinds of amino acids and more than 70 kinds of organic acids.

In particular, rice vinegar contains a lot of citric acid, that its high health benefits have became apparent in recent studies.

1. Benefit for Diet

Originally, it is said that you can have diet effect to reduce weight with vinegar. Rice vinegar is certainly no exception.
Amino acid and citric acid contained in vinegar have a function to help fight burning fat, thus these elements give the high benefit for diet.

2. Fatigue Recovery Effect

Late acid accumulates in the body after exercise or when you are tired from work, probably make your body become acidic.
It is said that the abundant amount of citric acid contained in unrefined vinegar decomposes lactic acid and saccharides, and changes the acidic body to alkaline and restores fatigue.

3. Prevent Kidney Stone

Rice vinegar contains high concentrations of citric acid that inhibits the growth of kidney stones.
Kidney stones are considered to be common in men over the age of 40, but it is said that drinking rice vinegar for prevention is effective.

4. Skin and Beauty Effect of Black Vinegar

It is said that rice vinegar has an effect that makes thick blood, which is the cause of (arteriosclerosis/the hardening of to arteries), to flow clean and smoothly.
This is expected to have the effect of preventing and improving diseases caused by blood flow such as low back pain and stiff shoulders.

5. Hypertension Prevention

The nature of vinegar is said to be useful for the prevention of hypertension.
Although there is no immediate effect, it is also expected to improve the condition of high blood pressure by keep drinking vinegar.

Easy Recipe Using Rice Vinegar

Like other vinegar, rice vinegar is not suitable for drinking directly as it is because it has acetic acid.

It's best to mixed it with dishes and eat them together.

Here, we will briefly introduce recipes using rice vinegar.

※Depending on the product, it may be diluted to make it easier to drink. Please drink according to the product's instructions.

Lightly Pickled Cucumber and Eggplant

Lightly pickled cucumber and eggplant


1 piece
1 piece
・Red chili pepper
1/2 piece
1/2 teaspoon
・Soup stock
3 tablespoons
・Rice vinegar
1 tablepspoons

 How to Make

Cut the cucumber and eggplant in one-bite size.
Put cucumbers and all seasoning in plastic bags, tie the plastic's mouth so that the air in vinyl can escape, and pickle them for 15 to 30 minutes.
When they had pickled, then it's complete. This is a simple and convenient recipe when you want to eat pickled cucumber and eggplant easily.



Mixed vinegar ingredients

450 grams
・Rice vinegar
4 tablespoons
4 tablespoons
2 teaspoons


Proper amount
as you like
・Salmon roe
2 tablespoons
(dipped in soy souce/shoyu)
2 pieces
・Mitsuba (Parsley;
East Asian wildparsley)
Proper amount
as you like

 How to Make

When the rice is finished cooked, mix the "mixed vinegar ingredients" and make sushi rice.
Cut the crab into one-bite sized pieces.
Cook the eggs, cut them into small pieces resemble string.
When the ingredients are mixed with "mixed vinegar ingedients," the it's complete. Enjoy your chirashizushi by yourself, with families, or with your beloved ones!

Product's Details

Product's Name Pure Rice Vinegar "Yamadai" 500 ML
Raw materials Organinc rice
Netto 500ml
Nutrition facts Per 100ml: energy 19kcal, protein 0.5g, fat 0g, carbohydrate 0.1g, salt 0g
Acidity 4.5%
Produced in Miyazaki Prefecture
Preservation method Avoid places with high temperature and direct sunlight
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