What is in sauce french?

It literally translates to "in sauce", and it means that a dish is prepared with a sauce, or that it is served with a sauce.

For example:

* "Le poulet en sauce" means "Chicken in sauce."

* "Les pâtes en sauce tomate" means "Pasta in tomato sauce."

It's important to note that "en sauce" is a very general term and doesn't specify the type of sauce. You would need to add the specific sauce type to be more precise.