This is a big place, containing a health-food store, cafe, and a restaurant. The restaurant (in the back of the building in a naturally-lit dining room) serves the set lunch Monday through Saturday from noon to about 130pm. I suggest getting there no later than 100pm. The price for the set lunch is 5.500 pesos as of March 2010. There is the option to get a piece of fish with the lunch, so it's not totally vegetarian here, but it's a good place to go if you are traveling with a non-veggie. The food was tasty, but the day I went, there was not a lot of protein on the plate (no tofu or gluten), so the protein came from the brown rice and the veggies. However, the food was very good and would return. If you don't make it in time for lunch, the cafe is open until early evening for coffee and snacks.
Updated from previous review on Saturday March 06, 2010
Update December 2012: I ate here twice while in Manizales in 2012. One day there was little to no protein on the plate, then today there were both beans *and* gluten. The menu is usually posted near the front door, and at the register where you pay before eating. The price is now 6600 pesos, and about double that if you want to include a portion of fish. This place probably has the best food of the veggie/veggie-friendly places I've tried in Manizales.
Cons: Sometimes not much protein in the meal