What are dyhydrated green onions?

"Dyhydrated green onions" is not a standard culinary term. It's likely a typo or mishearing.

Here's what's likely meant:

* Dehydrated Green Onions: This is the correct term for green onions that have had the majority of their water content removed. They are often used in cooking to add flavor and aroma without the bulk of fresh onions.

* Dihydrated Green Onions: This is a less common term, but it could refer to green onions that have been dehydrated twice, perhaps to achieve a more intense flavor or a more brittle texture.

If you encountered this term in a recipe or article, it's best to clarify with the author or source.