Wallyl,
Can't tell you name of the restaurant, but can tell you exactly where it is, my sister used to live within sight of it. Hwy 59, west side, right in the NW corner of the strip mall in West Chicago. Little place and being able to speak Spanish is an asset. Second one is also on the west side of Hwy 59 about 2 miles south of there and just north of Hwy 38. A more modern type with authentic food and Spanish is still a good idea. Also on the west side of Hwy 59 a half block north of the strip mall, is a Mexican grocery in a converted house that sells the authentic, made daily tortillas.
If you look North from the parkinglot of the strip mall or SW from the Mexican grocery, there is a modern built split level house, used to be light blue, that was built for my sister and her husband about 15 years ago. My Dad and I did a lot of the interior work, and built the front railings and rear deck. I think it was the sixth or seventh house west of Hwy 59. They kinda shared a back yard with the grocery there. They divorced five years later, and my sister is now deceased, but my two nieces and ex-BIL still live in Aurora.
Have you ever been to G.A.T Sports in Hanover Park or Dundee?