Assuming you mean how to say "I had lunch" or something similar, you could say:
J'ai pris le déjeuner
J'ai déjeuné
These aren't the only ways, however.
For other viewpoints (he had lunch, you had lunch, etc) you would change only "j'ai", replacing it with:
You (informal and singular): Tu as
He/She: Il or Elle a
We: Nous avons
You (formal and/or plural): Vous avez
They: Ils (males or a mixed group) or Elles (females only) ont
le déjeuner
Pack lunch in French is: panier repas
French lunch breaks are one hour long.
dejeuner
French bread, yourself
The phrase "after we eat lunch" directly translated to French is "après nous déjeunons"
French baguettes with a side of French fries
The proper term for lunch in French is "déjeuner".
déjeuner
dejéuner
Coffee
Food!