I know few people who study in Leuven and have never been to one of the ALMA restaurants. ALMA is an mensa academica or in English a student restaurant supported by the KU Leuven. They offer students as well as professors and university crew affordable meals while guests pay a bit more.
Although the menu is published on their website, it's quite a hassle to find out what's available where. Additionally their website isn't really mobile friendly. This Android application gives a simple yet clear overview of what's for dinner where.
The ALMA Android app can be found on Google Play.
EDIT: Because the ALMA website has been greatly improved and was no longer compatible with my parser, I decided to unpublish the application.