Only soy sauces that are made in JAS certified factories and meet the JAS standards can be sold with the JAS logo label. The JAS logo will provide a piece of mind that the soy sauce you are buying is authentic soy sauce produced under strict supervision at a trustworthy soy sauce factory.
Udon is known as a cheap, quick, and tasty Japanese fast food. Although the term "fast food" may be perceived as a recent phenomenon, udon has a long history and has been loved by people throughout Japan for more than 1,000 years.
The good thing about soy sauce is that no matter which one you choose, you won’t find any major disappointments and even when you find an unexpected flavor, you will find yourself saying, “Ok this works, too.”