Lalibela is my favorite lunch stop in Tempe. It is a great place to go to grab a quick $10 lunch with a friend. The service isn't the greatest, but because of the nature of Ethiopian food (everything is a stew) the dishes are delivered promptly. The only word of warning I have is to not get stuck in the back corner, as the server tends to forget the people back there.
I always get the 4-6-8 for lunch, which consists of:
Misir wat (Red lentils with a little bit of heat, although the level of "hot" can tend to vary from day to day)
Tikil gomen (A delicious potato, carrot, and cabbage combo)
Azifah (Cold lentils, with a bit of jalapeno for flavor)
The Injera (bread, which doubles as your eating utensil) is perfect and spongy. Note: Don't order the "half and half" with rice and a half injera, instead get the full injera so you don't need to use a fork.
If you want a fun, quick business lunch in Tempe, go to Lalibela