What is it called when they cook meat in a bag water?

You're likely thinking of sous vide cooking.

Here's how it works:

* Sous Vide (pronounced "soo-veed") is a French term meaning "under vacuum."

* Method: Meat (or other food) is vacuum-sealed in a bag and then submerged in a precisely temperature-controlled water bath.

* Benefits: This method allows for incredibly even cooking, resulting in perfectly tender and juicy meat with consistent results.

Let me know if you have any other cooking questions!