Why vinegar is used in noodles?

Here's why:

* Flavor Profile: Vinegar is generally acidic and has a sharp, sour taste. Noodles are often meant to be savory or sweet, so vinegar would be a clashing flavor.

* Cooking Process: Vinegar is rarely used in the cooking process for noodles. It wouldn't significantly change the texture or flavor in a desirable way.

* Regional Differences: While there may be some rare exceptions, vinegar is not a common ingredient in noodle dishes across the world.

When Vinegar is Used:

* Sauces: Vinegar can be used in dipping sauces or glazes for noodles, but it's not added directly to the noodles themselves.

* Pickling: Some types of noodles (like rice noodles) can be pickled in vinegar for a tangy flavor and preservation.

If you're wondering about a specific noodle dish where vinegar is used, please provide more context!