Can regular salt be used as substitute for kosher in a soup?

Yes, you can substitute regular table salt for kosher salt in a soup. However, there are a few things to keep in mind:

* Grain Size: Kosher salt has larger grains than table salt. This means you might need to use slightly more table salt to achieve the same level of saltiness.

* Iodine: Table salt typically contains iodine, while kosher salt does not. This is usually not a problem, but if you are trying to avoid iodine, you'll want to use kosher salt.

* Taste: While both salts are sodium chloride, there can be a slight difference in taste. Kosher salt is often considered to have a cleaner, more subtle taste than table salt.

Here's a general rule of thumb:

* If you're using a recipe that calls for kosher salt, start with 3/4 of the amount of table salt.

* Taste the soup as you go and add more table salt if needed.

Ultimately, the best way to ensure your soup is seasoned correctly is to taste it and adjust accordingly.