What do you say for kosher salt in Hindi?

Kosher salt in Hindi is "कॉशर नमक" (Kasher Namak).

However, it's worth noting that the term "kosher" is a foreign word and isn't used commonly in Hindi. You might find more people familiar with the term "मोटा नमक" (Mota Namak), which translates to "coarse salt." This is because kosher salt is often used as a coarse salt for cooking.