What is french for what did you have dinner?

The most common and natural way to say "What did you have for dinner?" in French is:

"Qu'est-ce que tu as mangé ce soir ?"

Here's a breakdown:

* Qu'est-ce que - What

* tu - you (informal)

* as mangé - have eaten

* ce soir - this evening

You can also use "pour dîner" instead of "ce soir" to be more specific about dinner.

"Qu'est-ce que tu as mangé pour dîner ?"