Looks like stir fried large rice noodle with some type of chill paste and tofu.

That doesn't look like rice noodles. Rather, flour ones. Not common to have rice noodles in the northern part of China, including Xian.

Looks like Look Fun to me. It's a rice very soft noodle. I but it in sheets here in Hawaii, and then we cut it into a size that goes with the sauce.

It is also called sha ho Fun.

lcuy - What you describe is rice noodles. But it's usually thinner and whiter in color. The one in the picture is yellowish and thicker. And as I mentioned, you don't find rice noodles in Xian usually.

Here in LA that dish is known as Chow Fun. It is made with wide rice noodles, usually prepared with beef, but also available with either chicken, shrimp, pork or tofu. Here the fresh noodles come in a plastic bag.

Hugely popular in Chinatown in SF, also found all over NYC. If you order it in the Bay Area, you will be asked if you want it wet or dry. For wet, I think the noodles are pre-soaked.

rkkwan, I think you are right. I don't think they were rice noodles. It was kind of heavy. Is Fun the noodle description or the sauce description. I'm more interested in the sauce. I'll look for some "Fun" recipes and see if that does it. Keep the suggestions coming. Thanks!

Fun is rice noodles. Mien is noodles made with flour. I am not sure what they put in that sauce.

Looks like Shanxi BiangBiang noodles:
http://hungerhunger.blogspot.hk/2012/01/biang-biang-noodles.html there's a recipe at the bottom.

tansmets: I believe you got it right.

It looks like 'Liang pi' to me. They are quite good I must say. I had it in a Xian Restaurant in NYC. The restaurant was recommended on the food network by Anthony Bourdain.
Next time you feel like Xian food, please consider coming to NYC first . We are hard hit by the hurricane and we can use as much money as you can spare.
Here is some info:
http://kaleidoscope.cultural-china.com/en/8K5763K11671.html
http://www.nytimes.com/2010/01/20/dining/20brief-001.html
http://www.xianfoods.com/locations.php

tansmets: I agree. That sure looks like it to me. Thank you!

Yes, that's it. Actually I had it once and forgotten about it, in Xining. This is my photo, before mixing it all:

http://rkkwan.zenfolio.com/tibet062610/e336b7f12

Oops. Wrong pic. This is the noodles:

http://rkkwan.zenfolio.com/tibet062610/h336B7F12#h3ab132d2