Jan,
I just looked at this site, and saw your message. I guess it was 10 or 11 years ago that I learned the recipe. One of the secretaries where I work gave me the recipe. Her husband and an older gentleman from Mexico Chiquito were fishing buddies. On one of their trips the two shared recipes, and the Mexico Chiquito red sauce was one of them. I don't know the date of that trip; I only know the recipe is correct for the exact taste and consistency of their red sauce. I ate at Mexico Chiquito yesterday for dinner.
My first time to eat at Mexico Chiquito was in 1962 when the restaurant was located at Protho Junction (or Rose City) in North Little Rock. In the early 1970s a restaurant in North Little Rock, Fisher's Restaurant, sold cheese dip with the exact coloring, aroma, consistency, and taste as Mexico Chiquito's. We were told by another restaurant owner that a cook from Mexico Chiquito had gone to work there, and began making the dip. I sure bought a lot of the cheese dip from that restaurant.