The Mensa is the university’s canteen, open to both students and staff. The food here is subsidized and therefore very low-priced.
Both Saarland University and RPTU Kaiserslautern-Landau have various cafeterias where you can have breakfast, lunch or dinner.
For more information on their locations and menus, please check the respective pages:
Mensa and Cafés at Saarland University